Probably a little late, but with simple equations, no. Simply maneuver any equation so that y is by itself on the left-hand side. On the right hand, the number that is by itself (no x attached) is your y-intercept on the graph - in this case (0,4). The number attached to the x is your slope. Remember it is rise over run (or in the case of negatives, descend over run). That means move up (or down) and then one over. If your slope is 1/2, then it means move up one and over two.
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