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The equations are

$\"\"$ Equation (1)

$\"\"$ Equation (2)

Since the coefficients of the b-terms are same, you can eliminate these

terms by subtracting the equations. Subtract the equations to eliminate variable b.

Write the equations in column form and subtract the corresponding columns.

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a = –5.

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Now Substitute –5 for a in either equation to find the value of b.

$\"\"$ (Equation 1)

$\"\"$ (Replace a by –5)

$\"\"$ (Multiply: $\"\"$ )

$\"\"$ (Add 15 to each side)

$\"\"$ (Commutative property: $\"\"$ )

$\"\"$ (Additive inverse property: $\"\"$ )

$\"\"$ (Add: $\"\"$ )

The solution is $\"\"$ . $\"\"$

The solution is $\"\"$ .