Question

Which is not an equation of the line that passes through the points (1, 1) and (5, 5)?


y - x = 0
x - y = 0
-x - y = 0 Which is not an equation of the line that passes through the points (1, 1) and (5, 5)?


y - x = 0
x - y = 0
-x - y = 0 @Mathematics

Answer 1

-x-y=0 is not an equation

Answer 2

-x - y = 0
is the answer b/c
-1-1=-2 not 0
-5-5=-10 not 0

Answer 3

I'd like to point out something. A line is a function you can invert on all R, since we know it to be bijective.
Bijectivity means the function is also injective, so for each element of the domain, you have a DIFFERENT element of the codomain.
This means, that if you give a x to your function, you can find just one y.
You can now draw your conclusion on how to find it :)