nevarezchiu7972
12.11.2020 •
Mathematics
Leah would like to earn at least $120 per month. She babysits for $5 per hour and works at an ice cream store for $8 per hour. Leah cannot work for more than 20 hours total per month for both jobs. Let x represent the number of hours Leah babysits and y represent the number of hours Leah works at the ice cream store. Which of the following graphs and system of inequalities shows the set of solutions for Leah earning at least $120 and working no more than 20 hours?
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Ответ:
Step-by-step explanation:
we know that
The linear equation in slope intercept form is equal to
where
m is the slope
b is the y-intercept
In this problem
Let
y is the cost of a telephone call
x is the number of minutes
The slope is equal to
The y-intercept is equal to
substitute
For x=T minutes
substitute
therefore
The expression that models the cost of a telephone call that last T minutes is