SOLUTION: if 5x - 3y = 7 and -3x - 5y = 23 what is the value of x? my answer choices are: A. (-1,-4) B. (-4,-1) C. -4 D. -1 I tried using substitution but I do not get any of the

Question 919866: if 5x - 3y = 7 and -3x - 5y = 23 what is the value of x?
my answer choices are:
A. (-1,-4)
B. (-4,-1)
C. -4
D. -1
I tried using substitution but I do not get any of the above answers so I am stuck.
Found 2 solutions by richard1234, richwmiller:
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
If (x,y) = (-1, -4), you have 5(-1) - 3(-4) = 7 and -3(-1) - 5(-4) = 23, both of which are true statements. So x = -1.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!

Solved by pluggable solver: SOLVE linear system by SUBSTITUTION

Solve:
We'll use substitution. After moving -3*y to the right, we get:
, or . Substitute that
into another equation:
and simplify: So, we know that y=-4. Since , x=-1.

Answer: .

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