The graph of that equation is a straight line. Every point on the line is a different
solution ('answer') to the equation. There are an infinite number of them.
Here are a few:
X . . . . . Y
-6 . . . -16
-4 . . . -12
-2 . . . -8
-1 . . . -6
0 . . . . -4
1 . . . . -2
2 . . . . 0
3 . . . . 2
3.17 . . 2.34
4 . . . . 4
6 . . . . 8
10 . . . 16
792 . . 1,580
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dy/dx = 5/4
One can say that X+7 equals 4Y but we can not get an answer for X or an answer for Y without knowing one of them first.
6x - 4y
5p + 4y
If: -4y+7 = 35-6 then y = -5.5