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2y - 4x = -12 Algebraically rearrange to 2y = 4x - 12 Divide both sides by '2' y = 2x - 6 So at the 'y' intercept, x = 0 Substituting x = 0 We have y = 2(0) - 6 Anything multiplied '0' is equal; to '0' Hence y = 0 - 6 y = -6 is the value of the y-intercept.
If you mean: 2y = -4x-12 then y = -2x-6 and -6 is the y intercept
4x+3y = 12 3y = -4x+12 y = -4/3x+4
If you mean: 8x-2y = -20 then y = 4x+10 whereas 4 is the slope and 10 is the y intercept
4x+2y = 6 2y = -4x+6 y = -2x+3 Perpendicular slope is 1/2