Question

in solving 31x +47y=15 and 47x+31y=63,we get​

Answer 1

Answer:

x=2

y=-1

Step-by-step explanation:

clearly x and y cofficient interchange each other

(31+47)x+(47+31)y=78 (adding both eqn)

78x+78y=78 =78 (x+y)=78

x+y=1 (1)

now 16x-16y=48 (subtracting1 from 2)

16 (x-y)=48

x-y=3 (2)

by elimination methos

x=2

putting in (2)

y=-1Ans