Solve for a
a=\frac{4789-y}{4}
Solve for y
y=4789-4a
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-4a=y-4789
Subtract 4789 from both sides.
\frac{-4a}{-4}=\frac{y-4789}{-4}
Divide both sides by -4.
a=\frac{y-4789}{-4}
Dividing by -4 undoes the multiplication by -4.
a=\frac{4789-y}{4}
Divide y-4789 by -4.
y=4789-4a
Swap sides so that all variable terms are on the left hand side.
Examples
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Matrix
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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