Question

I need help with this question

Answer 1

Hi there! The answer is 8 2 / 3

$\frac{3}{5} (r - 7) = 1$
First we need to get rid of the parentheses.

$\frac{3}{5} r - \frac{3}{5} \times \frac{7}{1} = 1$
$\frac{3}{5} r - \frac{21}{5} = 1$
$\frac{3}{5} r - 4\frac{1}{5} = 1$
Add 4 1/5 to both sides of the equation.

$\frac{3}{5} r =5 \frac{1}{5}$
Now divide both sides of the equation by 3 / 5 to find our answer.


$r = \frac{ 5 \frac{1}{5} }{ \frac{3}{5} } = 8 \frac{2}{3}$
Hence, our answer is 8 2 / 3

Answer 2

This is a distributive problem, so 3/5 x r will give you 3/5r and 3/5 x -7 will equal -4.2
Your equation will look like 3/5r - 4.2=1
Now you have to solve this...
So you add 4.2 to both sides to get your equation to like like this,
3/5r -4.2=1
        +4.2  =4.2      ---->  3/5r=5.2  now divide 5.2 by 3/5 to make r = 8.666