# SOLUTION: I need to solve for x and y by using substitution. I am not sure of how to go about doing this problem. If someone could help I would appreciate it. The problem is: {y=8-3x

Algebra ->  Algebra  -> Coordinate Systems and Linear Equations -> SOLUTION: I need to solve for x and y by using substitution. I am not sure of how to go about doing this problem. If someone could help I would appreciate it. The problem is: {y=8-3x       Log On

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 Question 240184: I need to solve for x and y by using substitution. I am not sure of how to go about doing this problem. If someone could help I would appreciate it. The problem is: {y=8-3x {2x-5y=11 I know that I need to multiply one problem to make the y's cancel but I am not sure. ThanksAnswer by ankor@dixie-net.com(15647)   (Show Source): You can put this solution on YOUR website!I need to solve for x and y by using substitution. y = 8 - 3x 2x - 5y = 11 : Note that y = (8-3x), substitute this for y in the 2nd equation 2x - 5(8-3x) = 11 Multiply what's inside the brackets, change the signs inside the brackets 2x - 40 + 15x = 11 2x + 15x = 11 + 40 17x = 51 x = x = 3 : Use the 1st equation to find y, substitute 3 for x y = 8 - 3(3) y = 8 - 9 y = -1 : : Check solutions by substitution in the 2nd equation 2x - 5y = 11 2(3) - 5(-1) = 11 6 + 5 = 11; confirms our solutions ; : you made the statement,"I know that I need to multiply one problem to make the y's cancel" This is not so in the substitution method. You've got it mixed up with the elimination method.