Question

x+y=8 ,x-y=10 find in substitution method​

Answer 1

Answer:

x=9 y=-1

Step-by-step explanation:

x+y=8

y=8-x

Now x-y=10

x-(8-x)=10

x-8+x=10

2x=18

x=9

thus y=8-x=8-9=-1

Answer 2

Answer:

x=9;y=-1

Step-by-step explanation:

x+y=8 ---1

x-y=10 ---2

in ----1,

x=8-y ---3

Substituting --3 in ---2,

8-y-y=10

8-2y=10

-2y=10-8

-2y=2

y=-1 ---4

Substituting --4 in --3,

x=8-(-1)

x=8+1

x=9

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