does the point (3,0) line on the line y=3x
Substitute the x value of (x,y) = (3,0) into y = 3x:
y = 3(3)
y = 9
Since y = 9 and y <> 0, then no, this point does not lie on the line
Does the point (0, 3) satisfy the equation y = x?
Plug in our values of x = 0 and y = 3:
3 = 0
This is false, so the point (0,3) does not satisfy the equation y = x