
Concept explainers
(a)
To calculate: To state slope and y-intercept of the graph of the equation and describe what they represent
(a)

Answer to Problem 26PPS
Slope is 32 and y-intercept is 15
Explanation of Solution
Given information: Sam has 15 teaspoons of chopped nuts. She uses 112 teaspoons for each muffin. The total amount of nuts that she has left y after x muffins can be given by y=−32x+15 . Graph of equation is
Formula Used:
Slope intercept form of line is y=mx+c , where
m= Slope of graph of equation
c= y-intercept of graph of equation
Calculation:
Equation is given as
y=−32x+15
Comparing the above equation to slope intercept form of line y=mx+c , slope and Y-intercept are
m=−32c=15
Slope represents the rate at which teaspoons of chopped nut is used
Y-intercept represents the amount of teaspoons of chopped nuts
(b)
To calculate: To name the x-intercept and describe what it represents
(b)

Answer to Problem 26PPS
x-intercept is (10,0)
Explanation of Solution
Given information: Sam has 15 teaspoons of chopped nuts. She uses 112 teaspoons for each muffin. The total amount of nuts that she has left y after x muffins can be given by y=−32x+15 . Graph of equation is
Formula Used:
Slope intercept form of line is y=mx+c , where
m= Slope of graph of equation
c= y-intercept of graph of equation
Calculation:
Equation is given as
y=−32x+15
In order to find x-intercept, put y=0 in the above equation
0=−32x+1532x=15x=15×23x=5×2x=10
Hence, x-intercept is (10,0)
X-intercept represents number of muffins baked
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