Question

Given the system of equations, what is the y-coordinate of the solution? 5x - 4y = 7 x = 5 - y

Answer 1

sub x = 5 - y into 1st equation
5 (5 - y) - 4y = 7
25 - 5y - 4y = 7
25 - 25 - 9y = 7 - 25
- 9y = - 18 divide both sides by -9
y = 2