Solve for x, y
x=\frac{4n}{3}-\frac{8}{9}
y=\frac{10}{3}-2n
Graph
Share
Copied to clipboard
3y+6n=10,2y+3x=4
To solve a pair of equations using substitution, first solve one of the equations for one of the variables. Then substitute the result for that variable in the other equation.
3y+6n=10
Pick one of the two equations which is more simple to solve for y by isolating y on the left hand side of the equal sign.
3y=10-6n
Subtract 6n from both sides of the equation.
y=\frac{10}{3}-2n
Divide both sides by 3.
2\left(\frac{10}{3}-2n\right)+3x=4
Substitute \frac{10}{3}-2n for y in the other equation, 2y+3x=4.
\frac{20}{3}-4n+3x=4
Multiply 2 times \frac{10}{3}-2n.
3x=4n-\frac{8}{3}
Subtract \frac{20}{3}-4n from both sides of the equation.
x=\frac{4n}{3}-\frac{8}{9}
Divide both sides by 3.
y=\frac{10}{3}-2n,x=\frac{4n}{3}-\frac{8}{9}
The system is now solved.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
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
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}