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How to solve this problem?

How to solve this problem?-example-1

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a.x=15.75 and y=13.75

b.Weight of large box is 110.25kg and 78.75kg

Weight of small box is 123.75kg and 41.25kg

7x+9y=234_____(1)

5x+3y=120_____(2)

making x the subject for eqn 2

x=120-3y/5_____(3)

substitute x into eqn 2

5(120-3y/5)+3y=120

840-21y+45y=1170

24y=330

y=13.75

put y=13.75 into eqn1

7x+9(13.75)=234

7x=234-123.75

7x=110.25

x=15.75

User Andras Vass
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