Question

This table shows the total cost with shipping of buying a certain number of posters from an online store.

Which equation represents the relationship between the number of posters, x, and the total cost, y?

y=12x+23

y equals 12 x plus 23

y=6x+5

y equals 6 x plus 5

y=6x+23

y equals 6 x plus 23

y=2x+12

Answer 1

Answer: y=6x+5

Explanation:

we can use system of equations to figure it out

assume format ax + b = y

a(3) + b = 23

a(5) + b = 35

Subtract equations from each other

-2a = -12

a=6

Now use substitution

(6)(3) + b = 23

18 + b = 23

b = 5

so therefore, y=6x+5