Solve for x
x=\frac{y-19}{3}
Solve for y
y=3x+19
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y-4=3x+15
Use the distributive property to multiply 3 by x+5.
3x+15=y-4
Swap sides so that all variable terms are on the left hand side.
3x=y-4-15
Subtract 15 from both sides.
3x=y-19
Subtract 15 from -4 to get -19.
\frac{3x}{3}=\frac{y-19}{3}
Divide both sides by 3.
x=\frac{y-19}{3}
Dividing by 3 undoes the multiplication by 3.
y-4=3x+15
Use the distributive property to multiply 3 by x+5.
y=3x+15+4
Add 4 to both sides.
y=3x+19
Add 15 and 4 to get 19.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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y = 3x + 4
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Matrix
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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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