input numbers for x and evaulate to get y values
if the slope is a/b, try inputing numbers that are multipules of b so you don't get fraction points
try 0 for x first
for first equation
3 is bottom number so try multipules of 3
if x=0, y=-1
(x,y)
(0,-1)
(3,-5)
(6,-9)
(-3,3)
(-6,7)
for second equation
bottom number is also 3 so try multipules of 3
(0,3)
(3,4)
(6,5)
(-3,2)
(-6,1)