If you plug in the x values of both (2, 8) and (4, 12) into each equation, you'll find that y = 2x + 4 gives you the correct y values for both (2, 8) and (4, 12). So that is your answer.
Answer:
x-4=19
Step-by-step explanation:
Hope that helps!
The formula is 2(wl+hl+hw) to calculate surface area fo a rectangular prism.