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Q.17.
x+y = 12
=>x = 12-y .....(I)
Putting the value of x from (I),
x-y = 8
=>12-y-y =8
=>-2y =8-12
=>y = -4/-2 =2
=>y=2
Putting the value of y in equation (I),
x = 12-2
=>x = 10
I can solve only Question no.17 as I am a student of 9 only and the questions are of class 10.
Hope this will help you. So mark it as Brainliest Answer.
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