Question

10th std Maths part1​

Answer 1

Answer:

7.

49x-57y=172

57x-49y=252

subtracting,

-8x-8y= -80

=> - 8(x+y)= -80

=> x+y= -80/-8

=> x+y=10

the answer is C

8.

2x-y=2

=> y=2x-2

the solution of this equation is (2,2)

so the answer is A