Question 79758
Y=3X+4 THE Y INTERCEPT(b)=(0,4)
NOW SET Y=0 & SOLVE FOR X
0=3X+4
3X=-4
X=-4/3 THUS THIS POINT IS (-4/3,0)
NOW PLOT THESE 2 POINTS & DRAW THE LINE THROUGH THEM WITH A SLOPE (m) OF 3.
[THIS IS THE RED LINE].
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Y=-3X-4 HAS A Y INTERCEPT OF (0,-4)
NOW SET Y=0 & SOLVE FOR X
0=-3X-4
-3X=4
X=4/-3 THUS THIS POINT IS (-4/3,0)
NOW PLOT THESE 2 POINTS AND DRAW A LINE THROUGH THEM WITH A SLOPE (m) OF -4/3
[THIS IS THE GREEN LINE] 
{{{ graph( 300, 200, -6, 5, -10, 10, y = 3x +4, y = -3x -4) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = 3x +4 and y = -3x -4).