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Justus Velez
Mathematics
14 January, 22:53
Solve the simultaneous equations
4x+3y=19 5x-4y=47
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Harper Andersen
14 January, 23:12
0
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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