Answer:
see explanation
Step-by-step explanation:
Substituting y = 3x - 4 into the equation gives
7x - 5(3x - 4) = 4 ← distribute and simplify left side
7x - 15x + 20 = 4
- 8x + 20 = 4 ( subtract 20 from both sides )
- 8x = - 16 ( divide both sides by - 8 )
x = 2
Substitute x = 2 into y = 3x - 4
y = 3(2) - 4 = 6 - 4 = 2
