# SOLUTION: I NEED HELP ON THIS PROBLEM {{ x+y=10}} {{ y=x-4}} in the book doesent explain it well and when mt teacher tells me how to do it its confusing! can

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 Click here to see ALL problems on Expressions-with-variables Question 62114: I NEED HELP ON THIS PROBLEM {{ x+y=10}} {{ y=x-4}} in the book doesent explain it well and when mt teacher tells me how to do it its confusing! can u help me thank you! Answer by stanbon(69061)   (Show Source): You can put this solution on YOUR website! 1st: x+y=10 2nd: y=x-4 -------- Substitute the value for y into the 1st equation, as follows: x+(x-4)=10 Simplify to get: 2x-4=10 2x=14 x=7 Now, substitute that value of x into the 2nd equation to solve for y, as follows: y=7-4=3 --------- Now check those answers in the 1st equation as follows: 7+3=10 10=10 ---------- Solution: x=7 and y=3 is the solution for the system of equations. Cheers, Stan H.