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The equations are
(Equation 1)
(Equation 2)
Since , substitute for y in the second equation.
(Equation 2)
(Replace )
(Subtract: )
Apply addition property of equality: Add 4y to each side.
(Apply additive inverse property: )
(Apply additive identity property: )
(Add: )
Apply division property of equality: Divide each side by 5.
(Cancel common terms)
(Divide: )
Now Substitute 3 for y in either equation to find the value of x.
(Equation 1)
(Replace y by 3 )
(Multiply: )
(Subtract: )
The solution is
The solution is .
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