3 years ago

3x - 4y = 18x + 3y = -7

Mathematics

1 answer:

Mnenie [13.5K]3 years ago

4 0

Answer:

x=2, y=-3

Step-by-step explanation:

x+3y+-7

move variable to the right and -3y from each side

x+3y-3y=-7-3y

x= -7-3y

3x -4y=18

3(-7-3y)-4y=18

solve for y, distribute

-21-9y-4y=18

collect like terms

-21-13y=18

move constant and change sign

-13y=18+21

add

-13y=39

divide by -13

y= -3

substitute

x=-7-3(-3)

solve

x=2

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3x - 4y = 18x + 3y = -7​

3x - 4y = 18x + 3y = -7