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3 years ago

Please simplify these expressions

Mathematics

2 answers:

oksano4ka [1.4K]3 years ago

8 0

-70r+80
-16n-62

:)))))))

Oksana_A [137]3 years ago

5 0

$10( - 2 - 9r) + 10(10 + 2r) = - 70r + 80 \\ 2(7n - 10) - 6(5n + 7) = - 16n - 62$

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Answer:

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subst y=10 and x=20 into the above

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Step by step explanation:

Step 1: when they say y varies directly with x they mean y is proportional to x
step 2: so y=kx where k is the constant
step 3: is to substitute y=10 and x=20 into the above equation y=kx
step 4: you will end up with 10=k20 then divide both sides by 20 so that k becomes the subject of the formula 
step 5: your answer from the above will be k=10/20 so the relationship is y is directly proportional to 1/2 x what you did here is that you substituted k for 1/2 in the equation in step 3
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So,

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