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y=-3X the line would cross the y-axis at (0,0)
rearrange: y = 3x - 3, which crosses the x-axis when y = 0, ie when x = 1
The vertical y axis on the Cartesian plane is both negative and positive
y = 3x + 1 y = 3x + 2 y = 3x + 3 y = 3x
y-3x-3 y=3x+3 A line with a slope of 3 crossing the y-axis at 3.