# SOLUTION: i need help....choose a method to slove the linear system. ( the two equations are together) 8x+y=15 2x+2y=9

Algebra ->  Algebra  -> Linear-equations -> SOLUTION: i need help....choose a method to slove the linear system. ( the two equations are together) 8x+y=15 2x+2y=9      Log On

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 Click here to see ALL problems on Linear-equations Question 23500: i need help....choose a method to slove the linear system. ( the two equations are together) 8x+y=15 2x+2y=9Found 2 solutions by elima, Paul:Answer by elima(1433)   (Show Source): You can put this solution on YOUR website!8x+y=15 2x+2y=9 There are different ways to solve this,I'll solve by substitution. Solve eq.1 8x+y=15 for y; 8x+y-8x=15-8x y=15-8x Now substitute this for y in the 2nd eq.; 2x+2(15-8x)=9 2x+30-16x=9 -14x+30=9 -14x=9-30 -14x=-21 x=1.5 Now that we have x we can plug that into eq.1 to get y; 8(1.5)+y=15 12+y=15 y=15-12 y=3 So the answer is; x=1.5 y=3 Hope you understand! =) Answer by Paul(988)   (Show Source): You can put this solution on YOUR website!You can either solve it with elimination method or subsitution method Subsitution method y=15-8x 2x+2y=9 sub in for y 2x+2(15-8x)=9 2x+30-16x=9 -14x=-21 x=1.5 Elimination method: 8x+y=15 (1) 2x+2y=9 (2) ---> multiply (1) by 2 16x+2y=30 2x+2y=9 ---> nopw subbtract 1 by 2 14x=21 x=1.5 Now just solve for y.