19. Solve by cross multiplication method :
(i) 3x = 2y = 12 and 4x – 5y = 16
(ii) 3x – 7y = 7 and 11x + 5y = 87
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Answer:
3x–2y=12
xy=12 is the answer
4x–5y=16
–1xy=16
15 is the answer
3x–7y=7
–4xy=7
7–4=3 is the answer
11x–5y=87
6=87
xy=87/6 is the answer
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