# SOLUTION: 49. 9x-12y=18 2y=-x+1 47. X+Y=1 0.75X+0.5Y=2.21 When I tried to solve 47 according to the book my calulations are wrong the book ans is 6.84,-5.84 and for 49 th

Algebra ->  Algebra  -> Coordinate Systems and Linear Equations -> SOLUTION: 49. 9x-12y=18 2y=-x+1 47. X+Y=1 0.75X+0.5Y=2.21 When I tried to solve 47 according to the book my calulations are wrong the book ans is 6.84,-5.84 and for 49 th      Log On

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 Question 62820This question is from textbook beginning algebra : 49. 9x-12y=18 2y=-x+1 47. X+Y=1 0.75X+0.5Y=2.21 When I tried to solve 47 according to the book my calulations are wrong the book ans is 6.84,-5.84 and for 49 the book ans is (8/5,-3/10 from both of these equation I got different ans. can you help me!!This question is from textbook beginning algebra Answer by checkley71(8403)   (Show Source): You can put this solution on YOUR website!47) X+Y=1 THEN X=1-Y NOW SUBSTITUTE (1-Y) FOR X IN THE OTHER EQUATION THUS .75(1-Y)+.5Y=2.21 .75-.75Y+.5Y=2.21 -.75Y+.5Y=2.21-.75 -.25Y=1.46 Y=1.46/-.25 Y=-5.84 SOLUTION. NOW SUBSTITUTE-5.84 FOR Y AND SOLVE FOR X X-5.84=1 X=1+5.84 X=6.84 SOLUTION -------------------------------------------------------------------- 49) 2Y=-X+1 X=1-2Y NOW SUB (1-2Y) FOR X IN THE OTHER EQUATION THUS 9(1-2Y)-12Y=18 9-18Y-12Y=18 -30Y=9 Y=9/-30 Y=-3/10 SOLUTION NO SUB -3/10 FOR Y AND SOLVE FOR X 2*-3/10=-X+1 -6/10=-X+1 X=1+6/10 X=16/10 X=8/5 SOLUTION