How do u find a solution using substitution?
5x-y=10 7x-2y=11
5x - y = 10
-y = -5x + 10
y = 5x - 10
Substitute that into the second equation.
7x - 2y = 11
7x - 2(5x - 10) = 11
7x - 10x + 20 = 11
-3x = 11 - 20 = -9
x = 3
Substitute that into the first equation.
5x - y = 10
5(3) - y = 10
15 - y = 10
-y = 10 - 15 = -5
y = 5