Question

1. If a : b = c :d, prove that :
(i) 5a + 7b : 5a - 7b = 5c + 7d : 5c – 7d.
(ii) (9a + 13b) (90 - 130)
= (9c + 13d) (9a - 13b).
(iii) xa + yb : XC + yd = b :d​

Answer 1

Answer:

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thanku sis

Answer 2

Answer:

hope it helps

pls mark me an brainalist answer