3 years ago

47x + 31y = 63 31x + 47y = 15

Mathematics

1 answer:

NikAS [45]3 years ago

7 0

Answer:

x = 2, y = -1

Step-by-step explanation:

47x + 31y = 63...eqn 1

31x + 47y = 15...eqn 2

multiply eqn 1 by 47 to get eqn 3 and multiply eqn 2 by 31 to get eqn 4...

=> 2209x + 1457y = 2961...eqn 3

=> 961x + 1457y = 465...eqn 4

subtract eqn 4 from eqn 3

=> 1248x = 2496

=> x =2

subst x =2 in eqn 1

=> 94 + 31y = 63

=> 31y = -31

=> y = -1

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