If you mean 3x+4y = 12 then y = -3/4x +4
Only when you multiply or divide by a negative number
If you mean: -10+4y = 12 then it is y = 2.5x+3
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If you mean 3x+4y = 12 then the x intercept = 4 and the y intercept = 3
If you mean: 4x -4y = 12 and -7x +4y = -36 then x = 8 and y = 5
3x + 4y = 12 subtract 3x to both sides4y = -3x + 12 divide by 4 to both sidesy = (-3/4)x + 3 directly we say that y-intercept is 3, to find x-intercept assigning y to 0;0 = (-3/4)x + 3-3 = (-3/4)x multiply by -4/3 to both sides(-3)(-4/3) = (-3/4)(-4/3)x4 = x the x-intercept is 4