Solve for x, y
x=3X-190
y=185-X
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y+X=185,15y+5x=1825
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.
y+X=185
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.
y=185-X
Subtract X from both sides of the equation.
15\left(185-X\right)+5x=1825
Substitute 185-X for y in the other equation, 15y+5x=1825.
2775-15X+5x=1825
Multiply 15 times 185-X.
5x=15X-950
Subtract 2775-15X from both sides of the equation.
x=3X-190
Divide both sides by 5.
y=185-X,x=3X-190
The system is now solved.
Examples
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Limits
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