3 years ago

Solve the system by substitution.

Mathematics

2 answers:

Elina [12.6K]3 years ago

5 0

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

Evgen [1.6K]3 years ago

4 0

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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