Seudónimo
Seudónimo
02-12-2016
Mathematics
contestada
solve system by elimination
9x-3y=3
3x+8y=-17
Respuesta :
apologiabiology
apologiabiology
02-12-2016
multiply 2nd equation by -3 and add to first
9x-3y=3
-9x-24y=51+
0x-27y=54
-27y=54
divide both sides by -27
y=-2
sub back
3x+8y=-17
3x+8(-2)=-17
3x-16=-17
add 16 to both sides
3x=-1
divide 3
x=-1/3
(x,y)
(-1/3,-2)
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