The graph shows four lines y1 = 4x + 3, y2 = 2x + 3, y3 = -2x + 3 and y4 = -4x + 3. What does switching the sign of the coefficient in front of x do to the line?
the slope of the line changes....
the lines slope down will change to slope up
and slope up will change to slope down.......................
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