12edonoghue 12edonoghue

10-03-2017
Mathematics

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Solve the simultaneous equations 7x+5y=32
3x+4y=23

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nick321 nick321

10-03-2017

3(7x+5y=32) and -7(3x+4y=23)
To make 21x+15=96 and -21x-28y=-161
Then add them to be -13y=-65
So y=-5
The substitute y
3x-20=23
3x=3
So x=1

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