The graph shows four lines y_{1} = 4x + 3, y_{2} = 2x + 3, y_{3} = -2x + 3 and y_{4} = -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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