# SOLUTION: Solve using the elimination method. -7x – y = -30 4x + y = 21

Algebra ->  Algebra  -> Polynomials-and-rational-expressions -> SOLUTION: Solve using the elimination method. -7x – y = -30 4x + y = 21       Log On

 Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations! Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help!

 Algebra: Polynomials, rational expressions and equations Solvers Lessons Answers archive Quiz In Depth

 Question 465516: Solve using the elimination method. -7x – y = -30 4x + y = 21 Answer by algebrahouse.com(1079)   (Show Source): You can put this solution on YOUR website!-7x - y = -30 4x + y = 21 ------------- -3x = -9 {added the two equations together, eliminating the y} x = 3 {divided both sides by -3} 4x + y = 21 {original bottom equation} 4(3) + y = 21 {substituted 3, in for x, into 4x + y = 21} 12 + y = 21 {multiplied 4 by 3} y = 9 {subtracted 12 from both sides} x = 3 and y = 9 For more help like this, ask the house: www.algebrahouse.com