Question

Identify the solution to this system of linear equations. y = x - 4 3x + 4y = 5

Answer 1

This is a set of simultaneous equations:

$y=x-4 \ \ (1) \\ 3x+4y=5 \ \ (2) \\ \\ y-x=-4 \\ 3x+4y=5 \\ \\ 3y-3x=-12 \\ 3x+4y=5 \\ \\ (1)+(2) \\ \\ 7y=-7 \\ \\ \boxed{y=-1} \\ \\ Sub \ y \ into \ (1) \\ \\ -1=x-4 \\ \\ \boxed{x=3}$