Help me with this please

Show this is false:  For each non-zero integer x there exists integer y such that xy=1

Let's take x=2, so our equation is

2y = 1

That has solution y=1/2 which isn't an integer, not in Z*.  There's no integer y that can solve this equation.  We found an x where the y doesn't exist, that's a counterexample to the claim.

the slope of the line is 60

one point on the line is (40,10)

step-by-step explanation:

in the equation outside the parenthesis the equation always tells you the slope. in this case it is 60.

in the parenthesis is also says 40 which is x because it is near the x and 10 is y because it is near y.

i dont know

step-by-step explanation:

umm. i dont know