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Sergio [31]
3 years ago
15

I need help with this question

Mathematics
2 answers:
julia-pushkina [17]3 years ago
7 0
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



aliya0001 [1]3 years ago
7 0
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





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