Write an equation in slope-intercept form (y = mx + b) for each situation.
1) Adam wants to buy a new cell phone and they have a crazy sale going on at Cricket!! He can buy a
cheap phone for only $7 and then pay $3 per month for talking minutes and texting. (Woah! )
a) Slope = ____________
c) Equation: ________________________
b) y-intercept = _____________
d) Graph:
e) What does the x-variable in your equation stand for? __________________________
What does the y-variable in your equation stand for?___________________________
e) What if Adam wanted to sign a year contract? Use the equation to find how much it would
cost. (Show all work!)
2) Katie decided she wants to start going to the gym. She has to pay a one-time fee of $6 and then $4 per
month after that.
a) Slope = ____________
c) Equation: ________________________
b) y-intercept = _____________
d) Graph:
e) What does the x-variable in your equation stand for? __________________________
What does the y-variable in your equation stand for?___________________________
e) What if Katie went to the gym for 15 months? Use the equation to find how much it would
cost. (Show all work!)
3) Eric wants to get a membership for the local video store. He has to pay $5 to become a member and then
$1 for every movie that he rents. (No late fees! )
a) Slope = ____________
c) Equation: ________________________
b) y-intercept = _____________
d) Graph:
e) What does the x-variable in your equation stand for? __________________________
What does the y-variable in your equation stand for?___________________________
e) What if Eric rented 20 movies the first month he had a memebership? Use the equation to find
how much it would cost. (Show all work!)