SOLUTION: In the equation x^2-y^2=8 if the value of y=-1, the value of X is A. -3 B. +3 C. +-3 - D. 9

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Question 1071305: In the equation x^2-y^2=8 if the value of y=-1, the value of X is
A. -3
B. +3
C. +-3
-
D. 9
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
What X ?


x%5E2=8%2By%5E2
x=0%2B-+sqrt%288%2By%5E2%29

Now let y=-1 and evaluate x.

Answer by MathTherapy(10553) About Me  (Show Source):
You can put this solution on YOUR website!

In the equation x^2-y^2=8 if the value of y=-1, the value of X is
A. -3
B. +3
C. +-3
-
D. 9
All you need to do is just substitute - 1 for y

So, 

Find x!

Why did you put x and X. It's one or the other as: x+%3C%3E+X.