4x - 2y = 12 divide by 2 both sides
2x - y = 6 subtract 2x to both sides
-y = -2x + 6 multiply by -1 to both sides
y = 2x - 6
Slope = m = 2, and y-intercept is -6.
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Equations are not linear when they are quadratic equations which are graphed in the form of a parabola
It makes it easier to work out values for x and y for graph plotting purposes.
You add one side of each of the equations to form one side of the new equation. You add the other sides of the equations to form the other side. Subtraction is done similarly.
Straight line equations have two variables in the form of x and y
Equation