# Thread: Find the sum of x and y

1. ## Find the sum of x and y

Okay so I think I know that x and/or y has to be negative.
But I dont know where to start from.

An ordered pair of real numbers (x,y) satisfies the equation $\displaystyle y$ = 4$\displaystyle x$ - 20 but does not satisfy the equation $\displaystyle y$/($\displaystyle x$-5) = 4. In the ordered pair, the value of x = y is:
a) 5 b)4 c) 20 d) 0 e) 24

2. Originally Posted by foreverbrokenpromises
Okay so I think I know that x and/or y has to be negative.
But I dont know where to start from.

An ordered pair of real numbers (x,y) satisfies the equation $\displaystyle y$ = 4$\displaystyle x$ - 20 but does not satisfy the equation $\displaystyle y$/($\displaystyle x$-5) = 4. In the ordered pair, the value of x = y is:
a) 5 b)4 c) 20 d) 0 e) 24

I would guess 5 because (x-5)=0 which doesn't work in the denominator. All the others ought to work because it's the same equation

3. Originally Posted by foreverbrokenpromises
Okay so I think I know that x and/or y has to be negative.
But I dont know where to start from.

An ordered pair of real numbers (x,y) satisfies the equation $\displaystyle y$ = 4$\displaystyle x$ - 20 but does not satisfy the equation $\displaystyle y$/($\displaystyle x$-5) = 4. In the ordered pair, the value of x = y is:
a) 5 b)4 c) 20 d) 0 e) 24