3x - y = -1 x = -2 3(-2) -y = -1 -6 - y = -1 -y = 5 y = -5
cross multiply 3/6=y/10 30=6y y=5
y/9 - 2/5 = 1/3 => y = 6 3/5 or 6.6
6
y = 6 x 3.5; If you can't do that in your head, split it up: 6 x 3 = 18, 6 x .5 = 3, 18 + 3 = 21
x = -5/3 y = -4/3
-6/y=5/-2 5y=12 y=12/5
x = 5 y = 2 4x - 3y = ? 4(5) - 3(2) = ? 20 - 6 = 14
x = -3/5 and y = -24/5
y = -2/5
-4
If: x = -5 Then: y = (3*-5)-1 = -16