Solve for x
x=\frac{y+8}{21}
Solve for y
y=21x-8
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21x=y+8
Add 8 to both sides.
\frac{21x}{21}=\frac{y+8}{21}
Divide both sides by 21.
x=\frac{y+8}{21}
Dividing by 21 undoes the multiplication by 21.
y=21x-8
Swap sides so that all variable terms are on the left hand side.
Examples
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Matrix
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Simultaneous equation
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Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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