Question

3(A) Select and write the most appropriate alternative from those provided
IF 13x + 12y = 7 and 12x + 13y = 5 then x-y-
(-12, -2, 12,21
​

Answer 1

13x+12y=7....i) 12x+13y=5....ii)

add i and ii

25x+25y=12

subtract i and ii

x-y =2