Lines and Slope  Chameleon Home  Ask Dr. Math 

Graphing Another Equation Let's ask Joan to graph a different line: y = 4x  2. Joan needs to find values for x and y that make the equation true. She decides to start by substituting 0 for x, just as before.
y = 4 * 0 2 y = 0  2 y = 2 Joan's substitution tells her the equation is true when When an equation is written like this one, it's fairly simple to find y by substituting different values for x. Joan decides to let x = 1:
y = 4 * 1  2 y = 4  2 y = 2 Now Joan knows that x = 1, y = 2 also works, so she graphs Next, Joan crawls down the yaxis and sticks her tongue straight through the two points. The straight part of her tongue will make a green trace. Before she leaves, Joan draws arrows to show that her line continues forever. She also labels the line with the equation it came from. Joan just graphed y = 4x  2. 
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