2 years ago

X + 3y = 18 -X - 4y = -25

Mathematics

2 answers:

Pachacha [2.7K]2 years ago

4 0

Answer:

x = -3

y= 7

Step-by-step explanation:

x + 3y=18 ----(1)

-x - 4y=-25 -----(2)

from equation (1)

x = 18 - 3y ---(3)

putting equation (3) into equation (2)

-(18 - 3y) - 4y = -25

18 + 3y -4y = -25

3y - 4y = -25 - 18

-y = -7

y = 7 ✓

Putting y=7 into equation (1)

x + 3(7) = 18

x + 21 = 18

x = 18 - 21

x = -3 ✓

SVEN [57.7K]2 years ago

3 0

-y=-7
Y=7
-x-4(-7)=-25
-x+28=-25
-x=3
X=-3

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