For each one . . .
=> solve the equation for 'y'. That means massage it around until it's
in the form of y = (thing1) x + (thing2).
=> When you do that, then 'thing1' is the slope of the line on the graph,
and 'thing2' is the number where the line crosses the y-axis.
=> When you have those two numbers, drawing the line on the graph
is a piece-o-cake.