So in the equation you substitute. The x to find y . Like u pick a point. For example :
Y=-4x+3
Y=-4(-2)+3
Y= 8+3
Y=11
This is your first point your guess number here would be -2 for x and your answer us y so will be 11. (-2,11). Table will be -2,11
-1, 7
0,3
1,-1
2,-5