Answer:
Explanation:
goal: equation that shows total amount she will pay
amount she will pay (y) depends on the number of photos she prints (x) + the cost of shipping (b)
flat rate = 3 means that even when NO photos are printed, you will pay $3, so this is our the y-intercept or initial value (b)
$0.18 per printed photo - for 1 photo, it costs $0.18 (0.18 *2 = 0.36 for 2 photos, etc.) - for "x" photos, it will be 0.18 * x, so this is our slope or rate of change (m)
This gives us the information we need to plug into y = mx + b
y = 0.18x + 3
a) "rate of change" is another word for slope = 0.18
b) "initial value" is another word for our y-intercept (FYI: "flat rate" or "flat fee" ALWAYS going to be your intercept) = 3
c) Independent variable is always x, what y depends on = number of printed photos
d) Dependent variable is always y = the total amount Elena will pay
Hope this helps!