Question

(5) To find (x + y) and (x - y). Solve simultaneous li

near equation
15x + 17y=21 and 17x + 15y = 11​

Answer 1

Answer:

x + y = 1

x - y = -5

Step-by-step explanation:

15x + 17y =21. eq 1

17x + 15y = 11. eq 2

adding eq 1 and eq 2, we get

32x + 32y = 32

32(x + y) = 32

x + y = 1

now,

subtracting eq 1 from eq 2

2x - 2y = -10

2(x - y) = 2 (-5)

x - y = -5