Question

Frodo and Sam are photographers. They take pictures of seniors for high school yearbooks. They charge a standard fee for taking the pictures. There's also a charge for each set of prints ordered. So the number of sets of prints determines the total cost.

Let S stand for the sets of prints ordered. Write the rule that describes a student's total cost.

Sets of prints Total cost
0 $15
1 $19
2 $23
3 $27

Answer 1

(0,15)(1,19)
slope = (19 - 15) / (1 - 0) = 4

y = mx + b
slope(m) = 4
(0,15)...x = 0 and y = 15
sub
15 = 4(0) + b
15 = b

y = 4x + 15....so ur rule is : F(s) = 4s + 15