13 A man travels x km at 60 km/h and y km 1 40 km/h and takes 2 hours for the journey. If the time taken to travel 5x km at 40 km/h and 3y km at 50 km/h is 11 hours 42 minutes, find x and y. y

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No 13
perimeter and the area of the rectangle.
40 km/h and3y km at 50 km/h is 11 hours
son. How old were they three years ago?
The diagram below is a rectangle. Find the
tive numbers is 2200. If the difference
A pen and a ruler cost N30. If the pen co
or senior secondary schools (2)
O The sum of the ages of a woman and her 5.4 Graphi
difference is 20. Find the two numbers
at 40 km/h and takes 2 hours for the
will be three and half times as old as her
its width. If the perimeter of the rectangle is
A man travels x km at 60 km/h and y km
between the two numbers is 22, find the
The product of two numbers is-30 and their
64 cm, find the area of the rectangle.
The length of a rectangle is 8 cm longer than
journey. If the time taken to travel 5x km at
son is 64 years. In 4 years time the woman
Note: For more examples, see WABP E
17 The difference of the squares of two posi-
One angle of a triangle is 70°. If the diffe
Simultaneous linear and o
tial Mathematics JSS book 3 chapter 1s
and Qu
Exercise 5.4
To use graphica
(1)
and th
I The sum of two numbers is 110
cquation on the
and y coordinate
cross to obtain
(2)
Example 5.13
Solve the fole
graphically.
y 2x+x-5
N8 more than the ruler, how much doe
item cost?
ence between the other two angles is
find the two angles.
Tubers of yams are Ny per kg and
are Np each. 4 kg of yams and 24 planta
cost N200, while 8 kg of yams and 10 pla
tains cost N210. Find the combined costd
a kg tuber of yam and a plantain.
A doctor and three nurses in a hospital to-
gether earn N255 000 per month, while
three doctors and eight nurses together
earns N720 000 per month. Calculate
(a) how much a doctor earns per month.
(b) how much a nurse earns per month.
Solution
42 minutes, find x and y.
Make a table ol
plantan
-3 -
2r 18
(5x + 5) cm
-3
(5x- y) cm
-5
-5
(4x + 1) cm
10
y
old
(x + 7y) cm
Make a table o
neir
ges
(Hint: opposite sides are equal, so equate
opposite sides to form two equations)
15 Find the perimeter and the area of the equi-
lateral triangle in the diagram below.
-2
5.
Remember tha
points are suffi
nd
In a positive number of two digits, the sum
of the digits is 15. If the digits are inter-
changed, the number is increased by 9. Find
the number.
(WAEC)
口
口口
Find a two-digit number such that three
times the tens digit is 2 less than twice the
units digit, and twice the number is 20
greater than the number obtained by revers-
ing the digits.
8.
(JAMB)
(a + 5) cm
Five years ago, a father was 3 times as old
as his son, now their combined ages amount
to 110 years. How old are they?
(Hint: All sides are equal, so equate one
Side to each of the other two to form two
equations).
(JAMB)
9 Np is invested at 10% and Ng is invested at
12%. The annual income from these in-
vestments is N3800. If these investments
are interchanged the annual income will be
N3900. Find p and q.
10 The ages of a man and a woman are in uhe
ratio 5: 4. In 12 years' time the ratio of
their ages will be 19:16. How old are they
Sum is -1. Find the two numbers.
Notice that the
Q as shown. R
the dotted line
two numbers.
now?
(2a - b) cm
(2b + 8) cm
Transcribed Image Text:perimeter and the area of the rectangle. 40 km/h and3y km at 50 km/h is 11 hours son. How old were they three years ago? The diagram below is a rectangle. Find the tive numbers is 2200. If the difference A pen and a ruler cost N30. If the pen co or senior secondary schools (2) O The sum of the ages of a woman and her 5.4 Graphi difference is 20. Find the two numbers at 40 km/h and takes 2 hours for the will be three and half times as old as her its width. If the perimeter of the rectangle is A man travels x km at 60 km/h and y km between the two numbers is 22, find the The product of two numbers is-30 and their 64 cm, find the area of the rectangle. The length of a rectangle is 8 cm longer than journey. If the time taken to travel 5x km at son is 64 years. In 4 years time the woman Note: For more examples, see WABP E 17 The difference of the squares of two posi- One angle of a triangle is 70°. If the diffe Simultaneous linear and o tial Mathematics JSS book 3 chapter 1s and Qu Exercise 5.4 To use graphica (1) and th I The sum of two numbers is 110 cquation on the and y coordinate cross to obtain (2) Example 5.13 Solve the fole graphically. y 2x+x-5 N8 more than the ruler, how much doe item cost? ence between the other two angles is find the two angles. Tubers of yams are Ny per kg and are Np each. 4 kg of yams and 24 planta cost N200, while 8 kg of yams and 10 pla tains cost N210. Find the combined costd a kg tuber of yam and a plantain. A doctor and three nurses in a hospital to- gether earn N255 000 per month, while three doctors and eight nurses together earns N720 000 per month. Calculate (a) how much a doctor earns per month. (b) how much a nurse earns per month. Solution 42 minutes, find x and y. Make a table ol plantan -3 - 2r 18 (5x + 5) cm -3 (5x- y) cm -5 -5 (4x + 1) cm 10 y old (x + 7y) cm Make a table o neir ges (Hint: opposite sides are equal, so equate opposite sides to form two equations) 15 Find the perimeter and the area of the equi- lateral triangle in the diagram below. -2 5. Remember tha points are suffi nd In a positive number of two digits, the sum of the digits is 15. If the digits are inter- changed, the number is increased by 9. Find the number. (WAEC) 口 口口 Find a two-digit number such that three times the tens digit is 2 less than twice the units digit, and twice the number is 20 greater than the number obtained by revers- ing the digits. 8. (JAMB) (a + 5) cm Five years ago, a father was 3 times as old as his son, now their combined ages amount to 110 years. How old are they? (Hint: All sides are equal, so equate one Side to each of the other two to form two equations). (JAMB) 9 Np is invested at 10% and Ng is invested at 12%. The annual income from these in- vestments is N3800. If these investments are interchanged the annual income will be N3900. Find p and q. 10 The ages of a man and a woman are in uhe ratio 5: 4. In 12 years' time the ratio of their ages will be 19:16. How old are they Sum is -1. Find the two numbers. Notice that the Q as shown. R the dotted line two numbers. now? (2a - b) cm (2b + 8) cm
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