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solve the system by substitution.
y=-x
y=4x+45
Multiple Choice.
A.(-9,-9)
B.(9,-9)
C.(9.9)
D.(-9,9)

Sagot :

D x= -9
Y=9
Because 4(-9)+45=9
I just put in each one and d got it right.
Panoyin
y = -x
y = 4x + 45

   -x = 4x + 45
- 4x  - 4x        
 -5x = 45
  -5     -5
    x = -9
y = 4x + 45
y = 4(-9) + 45
y = -36 + 45
y = 9
(x, y) = (-9, 9)

It is equal to B.
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