Algebra homework

Question

Correctly identify the first step in solving the system of equations by using the substitution method given the following equations:

x=2y-1

3x-4y=4

A. 3x-4y=2y-1

B. 3x-3(2y-1)=4

C. 3x-4x=4

D. 3(2y-1)-4y=4

Answer 1

Using substitution, you would replace the expression for x or 2y -1 in the second equation.

3x - 4y = 4

Replace x with 2y -1 as follows:

3(2y-1) - 4y = 4

Therefore, choice d is correct.