From the first equation: -3x = -6y +123 Subtract 6y from both sides x = 2y - 41 Divide by -3 Substitute above into the second equation: 9(2y - 41) - 7y = -226 18y - 369 - 7y = -226 11y = 143 Add 369 y = 13 Divide by 11 Then substitute y back into the first equation -3x + 6*13 = 123 -3x + 78 = 123 -3x = 45 x = -15 Hope that helps
-3x + 6y = 123 9x - 7y = -226 -3x+6y= 123 (multiply both sides by 9).............1 9x - 7y = -226 (multiply both sides by -3).............2 eq (1) substitute - eq (2) - 27x+54y=1107 -27x+21y=678 (-) ................................................ 33y=429 y=13 if y=13 then x is -3x+6y= 123 = -3x+(6X13)=123 x= (123- 78)/(-3) =-15 so the answer is x=-15 and y=13