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3 years ago

15

PLEASE HELP WILL MARK BRAINLIEST!!!!!!!!!!!!!!!

1 answer:

Mashutka [201]3 years ago

7 0

x = (15 - 8y)/9

-5[(15 - 8y)/9] + 12y = -107

(-75/9) + (40/9) + 12y = -107

y = -8.59

x = [15 - 8(-8.59)]/9

x = 9.3

(x,y) = (9.3, -8.59)

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4 years ago

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Margarita [4]

Answer:

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Step-by-step explanation:

Given:

$- 4x+y =9\\ x-3y = -6$

Express $y$ in terms $x$ of using the first equation.

$-4x+y=9\\y=4x+9$

Now, plug in the above value in second equation and solve for $x$ .

This gives,

$x-3y = -6\\x-3(4x+9)=-6\\x-12x-27=-6\\-11x-27=-6\\-11x=-6+27\\-11x=21\\x=\frac{21}{-11}=-\frac{21}{11}$

Now, plug in $x$ value and solve for $y$ . This gives,

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3 years ago