What is the value of a in the equation 3a + b = 54, when b = 9? 15 18 21 27

asked Jul 16, 2015 192k views

5 votes

What is the value of a in the equation 3a + b = 54, when b = 9?

15
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27

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4 votes

$\left \{ {{3a+b=54} \atop {b=9}} \right. \\\\Substitution\\\\ 3a+9=54\ \ \ | subtract\ 9\\\\3a=45\ \ \ | divide\ by\ 3\\\\ a=15\\\\ b=9$

Amurra answered Jul 16, 2015

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$3a+b=54 \\\\ 3a+9=54 \\\\ 3a=54-9 \\\\ 3a= 45 \\\\ \boxed{a=(45)/(3)\to15}$

Amir Rahbaran answered Jul 22, 2015

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