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luda_lava [24]
3 years ago
13

1/2(-9 + y)=2.5 solve for why. Please show me your steps

Mathematics
2 answers:
Oksi-84 [34.3K]3 years ago
7 0

Answer:

Y = 14

Step-by-step explanation:

1/2(-9 + y) = 2.5

1/2 * -9 = -4.5

1/2 * y = 0.5y

-4.5 + 0.5y = 2.5

+4.5             +4.5

0.5y = 7

/0.5   /0.5

y = 14

AlekseyPX3 years ago
5 0

Answer:

\frac{1}{2} ( - 9 + y) = 2.5 \\  - 4.5 + 0.5y = 2.5 \\ minus \:  - 45 \: both \: sides \: of \: the \: equation \\  \frac{0.5y}{0.5}  =  - \frac{ 7}{0.5}  \\   y =  14

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Answer:

Both of them correct.

$21.945

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Step-by-step explanation:

Oscar takes 30% of the normal price and subtracts it from the normal price. Out of 100% price he takes 30% so the result is: 100-30%= 70% of the normal price. Oscar's first step has the same result as Kim.

Oscar takes 10% of the discounted price (70%) and adds it back. The price will become 70% + 10%*70%= 77% of original price. Kim multiplies the discounted price with 110%, so the price will be: 70% * 110%= 77%. Both also give the same result.

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