On a blueprint with a scale of 1 cm = 4ft, the length of the wall is 9 cm. if the scale of the blueprint were 1 cm = 3 ft, what would be the length of the wall? plz show work and explain your work.

a. 12 cm
b. 13 cm
c. 15 cm
d. 18 cm

I'd say it's A because you multiply the 4 ft by 3 ft and you'll get 12 ft.

step-by-step explanation:

y = | -2(-2) |     →     y = | 4 |     →     y = 4       ⇒   (-2, 4)

y = | -2(-1) |     →     y = | 2 |     →       y =   2       ⇒   (-1, 2)    

y = | -2(0) |     →     y = | 0 |     →       y = 0         ⇒   (0, 0)

y = | -2(1) |   c →     y = | -2 |     →     y =   2         ⇒   (1, 2)    

y = | -2(2) |     →     y = | - 4 |     →     y =   4         ⇒   (2, 4)  

you can't solve x because it is 2 linear equation and you only have one equation