If you mean 12x+3y = -9 and -8x-2y = 14 then they are y = -4x-3 and y = -4x-7 respectively which means that they are parallel lines because they both have the same slope of -4 but with different y intercepts
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Yes the equation is parallel and this is why.... when you put the formula 9x+3y=12 in a slope intercept form you'll get 9x+3y=12 9x+3y-12=0 3y= -9x+12 divide by 3 y=-3x+4 12x+4y=18 12x+4y-18=0 4y= -12x+18 divide by 4 y= -3x + 9/2 In order for two equations to be parallel the slope must be equal to each other remember the slop is the m in y=mx+b. Since both equations have -3 as it's slope that makes them parallel lines.
y = - 4x - 4
If this is algebra then; 3x plus 12x = 15x
x2+12x+28Improved Answer:--x2+12x+28 = (-x+14)(x+2) when factored
8x-3+6x-1 = 12x+614x-4 = 12x+614x-12x = 6+42x = 10x = 5