Question

Determine weather (8.-9) is a solution of 4x-5y-3

Answer 1

Hmm, what?

Answer 2

Do you mean 4x-5y=3 (or -3)

Answer 3

yes

Answer 4

Substituting x=8 and y=-9 for x and y in the equation, we get
4(8)-5(-9)=3
32+45=3
but of course it does not.
That is, that point (8,-9) does not balance the equation, and is therefor not a solution

Answer 5

4x-5y=3


4(8)-5(-9)=3


32+45=3


77=3


Since the equation is NOT true, this means that (8,-9) is NOT a solution.