Question 876432: y-x=7
y+x=9
is it one, no, or infinitely solutions?
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! Add the two equations
y-x=7
y+x=9
------
2y+0x = 16
So 2y = 16 which means y = 8. I divided both sides by 2 to isolate y.
Because y = 8, we can use this to find x
y-x=7
8-x=7
8 = 7+x
8 - 7 = x
1 = x
x = 1
So we get one unique solution and it is (x,y) = (1,8)
|
|
|
