Question

if 7x+9y=42and 9x+7y=22,then find the value of (x+y)by using cross multiplication method

Answer 1

Answer:

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Explanation:

7x+9y=42 ...........(1)

9x+7y=22 ...........(2)

Add equations (1) and (2),

7x+9y+9x+7y=42+22

16x+16y=64

16(x+y)=64

x+y=4

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Answer 2

hey mate here's ur answer

I hope it might helps u .....