10x+2x-3y-4y=12x-7y
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4x + 3y - 2x - 7y2x - 4y
6-2x-8+3+12x+4y 10x+4y+1 Note that - -3 = +3 and that - -4y = +4y
If: 2x-3y = -15 and x = 4y Then: x = -12 and y = -3
-7y + 4y = -3y
2x - 3y = -4x + 4y = -9from the second equation x = -9-4y , substitute it in the first equation.2(-9-4y)- 3y= -4-18-8y-3y = -4-18-11y = -4-11y = -4+18-11y = 14y = -14/11now, solve for x :x = -9-4yx = -9-4(-14/11)x = -43/11