Solve: (a) 2t = 80 (b) -6.02 = -8.6t. We will use a property of equality to isolate the variable on one side of the equation. To solve the original equation, we want to find a simpler equivalent equation of the form t = a number or a number = t, whose solution is obvious. (a) To isolate t on the left side, we use the division property of equality. We can undo the multiplication by 2 by dividing both sides of the equation by 2. 2t = 80 This is the equation to solve. 2t 80 Use the division property of equality: Divide both sides by 2. 1t = Simplify 4 by removing the common factor of 2 in the numerator and denominator: = 1. t = 40 The product of 1 and any number is that number: 1t = t. If we substitute 40 for t in 2t = 80, we obtain the true statement 80 = 80. This verifies that 40 is the solution. The solution set is {40}. (b) To isolate t on the right side, we use the division property of equality. We can undo the multiplication by -8.6 by dividing both sides by -8.6. -6.02 = -8.6t This is the equation to solve. -6.02 -8.6t Use the division property of equality: Divide both sides by -8.6. -8.6 = t Do the division: 8.6 6.02. The quotient of two negative numbers is positive.

Algebra and Trigonometry (6th Edition)
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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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Help me with A and B, 

Solve:
(a)
2t = 80 (b)
-6.02 = -8.6t.
We will use a property of equality to isolate the variable on one side of the
equation.
To solve the original equation, we want to find a simpler equivalent equation of the
form t = a number or a number =
t, whose solution is obvious.
(a) To isolate t on the left side, we use the division property of equality. We can undo the multiplication by 2 by dividing both sides of the equation by 2.
2t = 80
This is the equation to solve.
2t
80
Use the div
ion property of equality: Divide both sides by 2.
2
2t
Simplify 4 by removing the common factor of 2 in the numerator and denominator:
= 1.
2
1t =
t = 40
The product of 1 and any number is that number: 1t = t.
If we substitute 40 for t in 2t = 80, we obtain the true statement 80 =
80. This verifies that 40 is the solution. The solution set is {40}.
(b) To isolatet on the right side, we use the division property of equality. We can undo the multiplication by -8.6 by dividing both sides by -8.6.
-6.02
-8.6t
This is the equation to solve.
-6.02
-8.6t
Use the division property of equality: Divide both sides by –8.6.
-8.6
= t
Do the division: 8.6 6.02. The quotient of two negative numbers is positive.
The solution is 0.7. Verify that this is correct by checking.
Solve.
(a)
17x = 204
X =
(b)
9.24 = -0.4r
r =
Transcribed Image Text:Solve: (a) 2t = 80 (b) -6.02 = -8.6t. We will use a property of equality to isolate the variable on one side of the equation. To solve the original equation, we want to find a simpler equivalent equation of the form t = a number or a number = t, whose solution is obvious. (a) To isolate t on the left side, we use the division property of equality. We can undo the multiplication by 2 by dividing both sides of the equation by 2. 2t = 80 This is the equation to solve. 2t 80 Use the div ion property of equality: Divide both sides by 2. 2 2t Simplify 4 by removing the common factor of 2 in the numerator and denominator: = 1. 2 1t = t = 40 The product of 1 and any number is that number: 1t = t. If we substitute 40 for t in 2t = 80, we obtain the true statement 80 = 80. This verifies that 40 is the solution. The solution set is {40}. (b) To isolatet on the right side, we use the division property of equality. We can undo the multiplication by -8.6 by dividing both sides by -8.6. -6.02 -8.6t This is the equation to solve. -6.02 -8.6t Use the division property of equality: Divide both sides by –8.6. -8.6 = t Do the division: 8.6 6.02. The quotient of two negative numbers is positive. The solution is 0.7. Verify that this is correct by checking. Solve. (a) 17x = 204 X = (b) 9.24 = -0.4r r =
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