Question 697758
you have to get rid of one of the unknowns by adding or subtracting the equations.
since the signs of the two equal unknowns are the Same .... Subtract the equations. (If the signs were Different ... aDd the equations)
Subtracting left hand and right hand sides gives
-6x+6y-(-6x+3y) = 6-(-12) removing brackets and simplifying
3y = 18
y = 6
substitute this value into either of the equations
-6x+36 = 6
-6x = -30
x = 5