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The equations are *.*

Equation (1)

* * Equation (2)

Solve the first equation *.*

According to addition property of equality: Add 3*y* to each side.

(Apply additive identity property: )

(Apply additive inverse property: )

* *(Apply additive identity property: )

Substitute * in equation (2).*

(Multiply: )

(Add: )

According to division property of equality: Divide each side by 10.

(Cancel common terms)

(Divide: )

Substitute in equation *.*

* *

(Multiply: )

The solution is .

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