Nevaanna20 Nevaanna20

17-09-2017
Mathematics

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solve the simultaneous equations
4x+3y=19 5x-4y=47

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Аноним Аноним

17-09-2017

4x + 3y = 19 multiply this by 4
5x - 4y = 47 multiply this by 3:-

16x + 12y = 76..............(1)
15x - 12y = 141............(2)

Add (1) + (2);-

31x = 217
x = 7

Now plug = 7 into the first equation:-

4(7) + 3y = 19
3y = 19 - 28 = -9

t = -3

Solution is x = 7, y = -3.

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