# SOLUTION: 9x+3y= -39 -9x+y = 71 y= 71+9x 9x+3(71+9x)= -39 9x+213+27x = -39 x= ? I know that the coefficient of x is 18 but then I forget how to solve for x

Algebra ->  Algebra  -> Coordinate Systems and Linear Equations -> SOLUTION: 9x+3y= -39 -9x+y = 71 y= 71+9x 9x+3(71+9x)= -39 9x+213+27x = -39 x= ? I know that the coefficient of x is 18 but then I forget how to solve for x       Log On

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 Click here to see ALL problems on Linear-systems Question 232888: 9x+3y= -39 -9x+y = 71 y= 71+9x 9x+3(71+9x)= -39 9x+213+27x = -39 x= ? I know that the coefficient of x is 18 but then I forget how to solve for x Answer by Alan3354(30983)   (Show Source): You can put this solution on YOUR website! 9x+3y= -39 -9x+y = 71 y= 71+9x 9x+3(71+9x)= -39 9x+213+27x = -39 ---------------- 36x + 213 = -39 36x = -252 x = -7 ------- y = 71+9x = 71 - 63 y = 8 --------- *************** Elimination would have been easier for this one, since the coefficients of x are the same. 9x+3y= -39 -9x+y = 71 -------------- 0x + 4y = 32 y = 8 ----- etc