Algebra-1

To solve the system of equations by substitution, we'll use the given expression for y and substitute it into the second equation.

Given the system:

y = 8x + 12

-5x + 4y = 21

Step 1: Substitute y = 8x + 12 into the second equation

-5x + 4(8x + 12) = 21

Step 2: Distribute and simplify

Distribute the 4 on the right-hand side:

-5x + 32x + 48 = 21

...