Question

metodo de sustitucion
8x-7y=15
x+6y=-5

Answer 1

y=. -1

x=. +1




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Answer 2

8x-7y=15

x6y=-5

8x-7(15+1)=-5

8x-105-7=-5

1a=-5+105

1a=100

a=-1+100

a=99