Linear function
Example: y=–2x+4. Substituting x=0 we get y=4 (this is the y-intercept) and thus the point (0,4). Substituting x=1, we get y=2 and thus the point (1,2). Plot these points and draw the line. (Notice that the 2nd point is 1 to the right and 2 down from the 1st point. As we said in the above example, this happens because the slope is m= –2)