If you mean -12x+3y = 15 then y = 4x+5
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3x+12x = 15 15x = 15 x = 1
The answer is 180.
-7 (negative 7) transpose the 9x then transpose the 6. divide both sides by 3x and your answer will be -7 =]
15.015
It can't be solved because the discriminant of the given quadratic equation is less than zero meaning it has no real roots.