APLICANDO O MODO DA SUBSTITUIÇÃO, RESOLVA OS SEGUINTES SISTEMA 2X2:?
A) {x-y=5
x+3y=9}
B) {3x-2y=6
x-3y=2}
C) {x+y=4
2x+y=7}
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A) {x-y=5
x+3y=9}
B) {3x-2y=6
x-3y=2}
C) {x+y=4
2x+y=7}
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Verified answer
A)
x=5+y
5+y+3y=9
4y=9-5
y=4/4
y=1
x=5+1
x=6 (6,1)
B)
x=2+3y
3(2+3y)-2y=6
6+9y-2y=6
7y=6-6
y=0/7
y=0
x=2+3(0)
x=2 (2,0)
C)
x=4-y
2(4-y)+y=7
8-2y+y=7
-y=7-8
-y=-1
y=1
x=4-1
x=3 (3,1)