Question

6/x +4/y=20 9/x-7/y=10.5 elmination method

Answer 1

1/x=a 1/y=b

(6a+4b=20)7

(9a-7b=10.5)4

42a+28b=140

36a-28b=42

78a=182

A=7/3, x=3/7

B=3/2,y=2/3

Don't check for calculation mistake just learn the method