Complete the proof If 7a + b = 24 and b = 3, then a = 3

7a + b = 24

7a + 3 = 24 {substituted 3 in for b}

7a = 21 {subtracted 3 from each side}

a = 3 {divided each side by 7}

Not written as a proof, but it is proof.

7a + 3 = 24 {substituted 3 in for b}

7a = 21 {subtracted 3 from each side}

a = 3 {divided each side by 7}

Not written as a proof, but it is proof.

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