ratu888
ratu888
03-02-2015
Mathematics
contestada
2x +3y =12 Dan 3x-1y=7
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tabboo123
tabboo123
03-02-2015
2x+3y=12
3y=-2x+12
y=-2x/3+4
3x-1y=7
-1y=-3x+7
y=3x-7
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apologiabiology
apologiabiology
03-02-2015
2x+3y=12
3x-y=7
use subsituttion
make one of the equations equal to a placeholder
3x-y=7
subtract 7
3x-7-y=0
add y
3x-7=y
subsisute 3x-7 for y in first equation
2x+3(3x-7)=12
2x+9x-21=12
11x-21=12
add 21 to both sides
11x=33
divide both sides by 11
x=3
subsitute x for 3 in any equation
3x-7=y
3(3)-7=y
9-7=
2=y
x=3
y=2
Answer Link
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