How do you solve $4y+12=4$ ?

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Answer 1 · 2018-05-11T06:46:20

$y=-2$

You want to solve $4y+12=4$
We can think of this as some amount plus 12 = 4.
The amount itself, therefore, must be 12 less than 4, i.e. $4-12=-8$

We, therefore, have $4y=-8$ .
But if 4 of something is -8, then that something must be 1/4 of -8 i.e. -2

It, therefore, follows that y=-2

In mathematical terms we have

$4y+12=4$
$4y+12-12=4-12=-8$ (deduct 12 from both sides)
$4y=-8$
$(4y)/4=-8/4=-2$ (divide both sides with 4)
$y=-2$

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