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3 years ago

8

-28 + 10.r - 5.r = 42step my step explation

2 answers:

Maksim231197 [3]3 years ago

6 0

Answer: $r=14$

Step-by-step explanation:

1) Move all terms to the left: $-28+10r-5r-(42)=0$

2) Add all the numbers together, and all the variables: $5r-70=0$

3) Move all terms containing r to the left, all other terms to the right: $5r=70$

$r=70/5$

$r=14$

Lelechka [254]3 years ago

3 0

Answer:

r = 14

Step-by-step explanation:

-28 + 10r - 5r = 42

<em>(</em><em>Subtract</em><em> </em><em>the</em><em> </em><em>like</em><em> </em><em>terms</em><em>,</em><em> </em><em>10r</em><em> </em><em>-</em><em> </em><em>5r</em><em>)</em>

-28 + 5r = 42

<em>(</em><em>Add</em><em> </em><em>+</em><em>2</em><em>8</em><em> </em><em>to</em><em> </em><em>each</em><em> </em><em>side</em><em>)</em>

+28 - 28 + 5r = 42 + 28

<em>(</em><em>Subtract</em><em> </em><em>like</em><em> </em><em>terms</em><em>,</em><em> </em><em>2</em><em>8</em><em> </em><em>-</em><em> </em><em>2</em><em>8</em><em> </em><em>and</em><em> </em><em>add</em><em> </em><em>terms</em><em> </em><em>4</em><em>2</em><em> </em><em>+</em><em> </em><em>2</em><em>8</em><em>)</em>

5r = 70

<em>(</em><em>Divide</em><em> </em><em>each</em><em> </em><em>side</em><em> </em><em>by</em><em> </em><em>/</em><em>5</em><em>)</em>

5/5r = 70/5

<em>(</em><em>Divide</em><em>)</em>

r = 14

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