2 years ago

7x + 4y = -3 -7x - 5y = 9 How do I solve using elimination

Mathematics

1 answer:

mel-nik [20]2 years ago

5 0

Answer:

X=3, y=-6

Step-by-step explanation:

7x+4y=-3 equation 1

-7x-5y=9 equation 2

-y=6. Add above two equations

Y=-6

solve for x by inputting y value into either equation.

7x+4(-6)=-3

7x-24=-3

7x=21

x=3

check answer by inputting x and y values into either equation

-7x-5y=9

-7(3)-5(-6)=9

–21+30=9

9=9

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