Question

solve using substitution.
8x - 4y = 4
y = -7
(□, □)

Explanation:

Step1: Substitute \( y = -7 \) into the first equation

We have the equation \( 8x - 4y = 4 \). Substitute \( y = -7 \) into it: \( 8x - 4(-7) = 4 \).

Step2: Simplify and solve for \( x \)

First, calculate \( -4(-7) = 28 \), so the equation becomes \( 8x + 28 = 4 \). Subtract 28 from both sides: \( 8x = 4 - 28 = -24 \). Then divide both sides by 8: \( x = \frac{-24}{8} = -3 \).

Answer:

\((-3, -7)\)