Zero. Y=4 is a horizontal line.
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The slope is -4
3x+y = 4 y = -3x+4 Perpendicular slope: 1/3
4
2x + 3y = 12 y = -2/3 y + 4 slope is -2/3
4x + 3y = 12 3y = -4x + 12 y = -4/3x + 4 The slope is therefore -4/3 (the coefficient of the x term) The y intercept is 4 (the value of y when x = 0)