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Alborosie
4 years ago
5

Solve the system of equations. −5x+2y=9 y=7x ​

Mathematics
2 answers:
Alona [7]4 years ago
6 0

Answer:

x=1\\y=7

Step-by-step explanation:

-5x+2y=9\\y=7x

Replace y in the first equation.

-5x+2(7x)=9

Distribute the 2 and combine like terms;

-5x+14x=9\\9x=9

Divide by 9

x=\frac{9}{9}\\ x=1

-----------------------------------------------

After having found x, you can replace it in any of the equations to find y. I'll use the second equation.

y=7x\\y=7(1)\\y=7

RUDIKE [14]4 years ago
5 0

Answer:

x=1  y=7

Step-by-step explanation:

−5x+2y=9

y=7x

Substitute the second equation into the first

-5x +2(7x) = 9

Distribute

-5x +14x = 9

Combine like terms

9x=9

Divide by 9

9x/9 =9/9

x= 1

Now find y

y = 7(1)

y = 7

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Answer:

28 l of 80%

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Step-by-step explanation:

Target is 70 l of 50% solution

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x+y=70 is the equation for total volume, and

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3 years ago
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Answer:

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<u>Points to remember</u>

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