Solve for x
x=12-4y
Solve for y
y=-\frac{x}{4}+3
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-0.25x+3=y
Swap sides so that all variable terms are on the left hand side.
-0.25x=y-3
Subtract 3 from both sides.
\frac{-0.25x}{-0.25}=\frac{y-3}{-0.25}
Multiply both sides by -4.
x=\frac{y-3}{-0.25}
Dividing by -0.25 undoes the multiplication by -0.25.
x=12-4y
Divide y-3 by -0.25 by multiplying y-3 by the reciprocal of -0.25.
Examples
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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Limits
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