Question

Given the following equation, substitute (3x + 4) in for y, and solve for x.
7x + 6y = 99

Answer 1

x=3

Explanation:

Distribute

7x+6(3x+4)=99

7x+18x+24=99

Combine like terms

7x+18x+24=99

25x+24=99

Subtract 24 from both sides

25x+24=99

25x=75

Divide both sides by the same factor

25x=75

x=3