Question

questions in the pic

Answer 1

ax + by = a - b
bx - ay = a + b

Multiply equation 1 by a and equation 2 by b

a²x + aby = a² - ab
b²x - aby = ab + b²

Adding them

(a² + b²) x = (a² + b²)

x = 1

Now put x = 1 in equation 1, then y = -1

So, (1,-1) is the solution

Answer 2

hi,
hope it helps.
.......