Use your graphing calculator to graph the following four equations simultaneously on the window [210, 10] by [210, 10]:
y 1 = 2x+6
y 2 = 2x+2
y 3 = 2x - 2
y 4 = 2x - 6
a. What do the lines have in common and how do they differ?
b. Write the equation of another line with the same slope that lies 2 units below the lowest line. Then check your answer by graphing it with the others.
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