Question

decide if the ordered pair (3,-2) is a solution to the equation 2x-y=4.
yes or no?

Answer 1

Replace x with 3 and y with -2. This is because all points are of the form (x,y)

2x-y=4

2(3)-(-2)=4

6 + 2 = 4

8 = 4 ... this is FALSE, so (3,-2) is NOT a solution to 2x-y=4


In other words, the point (3,-2) is NOT on the line 2x-y=4

Answer 2

Thanks Jim. Thank is what I thought, but for some reason I always get confused to change the 2nd to a positive or not so I wanted to make sure haha.

Answer 3

Just remember that negatives are like saying opposites

So -(-2) is the same as "the opposite of -2" which is really +2

Another way is to think of the two negatives cancelling to make a positive