fanny031722
fanny031722
28-04-2016
Mathematics
contestada
2x + y =20
6x - 5y =12
Respuesta :
apologiabiology
apologiabiology
28-04-2016
multiply firs equaiton by -3
-6x-3y=-60
add to other equation
-6x-3y=-60
6x-5y=12 +
0x-8y=-48
-8y=-48
divide by -8
y=6
sub
2x+y=20
2x+6=20
minus 6
2x=14
divide 2
x=7
x=7
y=6
(7,6)
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