How do you solve 7+ 4y = 39?

Apr 23, 2018

y=8

Explanation:

you'll want to get y by itself one one side of the equation, so subtract a 7 from both sides

$7 + 4 y = 39$
subtract 7 from both sides

=$4 y = 32$

divide both sides by 4 to isolate y

=$y = 8$

Apr 23, 2018

$y = 8$

Explanation:

We have to reverse the mapping to find out the answer

Minus 7 on both sides

$7 - \textcolor{red}{7} + 4 y = 39 - \textcolor{red}{7}$

$4 y = 32$

Now divide both sides by 4

$\frac{4}{\textcolor{red}{4}} y = \frac{32}{\textcolor{red}{4}}$

$y = 8$

Apr 23, 2018

$y = 8$

Explanation:

In order to find $y$, we must first isolate the variable. Therefore, we subtract $7$ from both sides.

$7 - 7 = 0 \mathmr{and} 39 - 7 = 32$

Now, we're left with

$4 y = 32$

We still need to isolate the variable. Thus dividing by $4$ on both sides;

$\frac{4 y}{4} = y \mathmr{and} \frac{32}{4} = 8$

So

$y = 8$