Solve for x
x=\frac{4\left(y-13\right)}{5}
Solve for y
y=\frac{5x}{4}+13
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y+7=\frac{5}{4}x+20
Use the distributive property to multiply \frac{5}{4} by x+16.
\frac{5}{4}x+20=y+7
Swap sides so that all variable terms are on the left hand side.
\frac{5}{4}x=y+7-20
Subtract 20 from both sides.
\frac{5}{4}x=y-13
Subtract 20 from 7 to get -13.
\frac{\frac{5}{4}x}{\frac{5}{4}}=\frac{y-13}{\frac{5}{4}}
Divide both sides of the equation by \frac{5}{4}, which is the same as multiplying both sides by the reciprocal of the fraction.
x=\frac{y-13}{\frac{5}{4}}
Dividing by \frac{5}{4} undoes the multiplication by \frac{5}{4}.
x=\frac{4y-52}{5}
Divide y-13 by \frac{5}{4} by multiplying y-13 by the reciprocal of \frac{5}{4}.
y+7=\frac{5}{4}x+20
Use the distributive property to multiply \frac{5}{4} by x+16.
y=\frac{5}{4}x+20-7
Subtract 7 from both sides.
y=\frac{5}{4}x+13
Subtract 7 from 20 to get 13.
Examples
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y = 3x + 4
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Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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