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OpenStudy (anonymous):
what is the solution of the system 5x + 6y = 20 , 9x + 11y = 32
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OpenStudy (zzr0ck3r):
ok 5x+6y=20 9x+11y=32 9(5x+6y) = 9*20 -5(9x+11y)=-5*32 45x+54y=180 -45x-55y=-160 add the equations -y=20 y=-20 so 5x+6(-20)=20 5x-120=20 5x=140 x=28
OpenStudy (zzr0ck3r):
ask questions if you dont understand
OpenStudy (anonymous):
i think i get this one thanks
OpenStudy (raden):
alternative : |dw:1387914452875:dw| asks questions too, if you dont understand this :)
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