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Luba_88 [7]
3 years ago
12

Use the elimination to solve this equation. 2x+3y=55 9x+4y=105

Mathematics
1 answer:
seropon [69]3 years ago
6 0
X=5 y=15 (5,15). 
This is how you do it:
-4(2x+3y=55): -8x-12y=-220
3(9x+4y=105):27x+12y=315

You add the two new equations together, canceling out the y values, and get the x value. Then, you go back and plug in the x value in the original equation to get the y value.

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Anastasy [175]

Answer:

$45

Step-by-step explanation:

Here we need to calculate the income of this year.

We know that a year has 52 weeks. And, our payed weeks are 51, they are, the 50 weeks we work plus the one week of paid-vacation. The remaining week does not give us income, as is unpaid. So our total year income is:

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6 0
3 years ago
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Answer:

9.     6k + 5 and 2k - 1.

10.    5√2 .

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9.    Area = 12k^2 + 4k - 5

Factoring:

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= 6k(2k - 1) + 5(2k - 1)

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= 10 √2  / 2

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