If $4a+b=12$ , then what is $a$ ?

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Answer 1 · 2015-12-20T09:37:47

$a=(12-b)/4$ or $3-b/4$

$4a+b=12$

Subtract $b$ from both sides.

$4a+b$ $color(red)(-b)=12$ $color(red)(-b)$

$4a=12-b$

Divide $4$ from both sides.

$4acolor(red)(-:4)=(12-b)color(red)(-:4)$

$a=(12-b)/4$ or $3-b/4$

If 4a+b=124a+b=12, then what is aa?