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3 years ago

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

Mathematics

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

(Subtract the like terms, 10r - 5r)

-28 + 5r = 42

(Add +28 to each side)

+28 - 28 + 5r = 42 + 28

(Subtract like terms, 28 - 28 and add terms 42 + 28)

5r = 70

(Divide each side by /5)

5/5r = 70/5

(Divide)

r = 14

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3 years ago

Read 2 more answers

3x + ky = 8

sattari [20]

Answer:

(a): x is 3 and ky is -1

(b): k is -2

Step-by-step explanation:

Let: 3x + ky = 8 be equation (a)

x - 2 ky = 5 be equation (b)

Then multiply equation (a) by 2:

→ 6x + 2ky = 16, let it be equation (c)

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${ \sf{(6 + 1)x + (2 - 2)ky = (16 + 5)}} \\ { \sf{7x = 21}} \\ { \sf{x = 3}}$

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3 years ago

)

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Answer:

B. 25.40 cm

You're welcome

8 0

3 years ago

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

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