Solve
-8x - 3y = -5
-2x + 7y = -9
2 answers:
Answer:
x = 1
y = - 1
Step-by-step explanation:
-8x - 3y = -5
-2x + 7y = -9 | × (-4)
-8x - 3y = - 5
8x - 28y = 36 +
________________
- 8x + 8x - 3y - 28y = - 5 + 36
- 31y = 31
31y = - 31
y = - 1
- 8x - 3(-1) = - 5
- 8x + 3 = - 5
- 8x = - 8
8x = 8
x = 1
Answer:
x=1 y=-1
Step-by-step explanation:
-8x - 3y = -5
-2x + 7y = -9
Multiply the second equation by -4
-4(-2x + 7y) = -9*-4
8x -28y = 36
Add this to the first equation
-8x - 3y = -5
8x -28y = 36
-------------------------
-31y = 31
Divide each side by -31
-31y/-31 = 31/-31
y= -1
Now we can find x
-2x +7y =-9
-2x +7(-1) = -9
-2x-7 =-9
Add 7 to each side
-2x -7+7 =-9+7
-2x =-2
Divide by -2
-2x/-2 = -2/-2
x=1
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