The equation 6 + y = 12 is a simple equation in one variable. If you add 6 to both sides of the equals sign, you get y = 18, and that is the solution.
x = 2 and y = -4
y=6
Presumably this is a simultaneous equation question in the form of: 4x-y = 32 4x+5y = -16 Subtract the bottom equation from the top equation remembering that a -- is equal to a + so 32--16 is +40 and that -+5y-y is -6y: -6y = 48 Divide both sides by -6 to find the value of y: y = -8 Substitute the value of y into the original equations to find the value of x: So: x = 6 and y = -8
If for example: 4y = 16 Then: y = 4
4
If: 6+y =37 Then: y = 31
2y= 32 y=16
-16
y=+6 or y=-3
If: y+5 = 11 Then: y = 6
Then the straight line equation is: y = -4x+6