A rational expression is undefined if the denominator is zero. Since the denominator is 
, the expression is undefined if
(x-9) (x+2)=x²+2x-9x-18=x²-7x-18
Answer:
x = 2
Step-by-step explanation:
3.x + y = 11 (eq 1)
Y = x + 3 (eq 2)
sub 2 into 1
3x + x + 3 = 11
4x + 3 = 11
4x = 8
x = 2
Answer:
is
Step-by-step explanation:
so I calculated this and I got a fraction
I got 64/135
Answer:
(5,6)
Step-by-step explanation:
-6x+6y=6
-6x + 3y =-12
Multiply the first equation by -1
6x-6y=-6
Add this to the second equation
6x-6y=-6
-6x + 3y =-12
---------------------
-3y = -18
Divide each side by -3
-3y/-3 = -18/-3
y =6
Now we need to find x
6x - 6y = -6
6x -6(6) = -6
6x -36 = -6
Add 36 to each side
6x-36+36 = -6+36
6x = 30
Divide each side by 6
6x/6 = 30/6
x =5
