Question

21x+47y =110
47x -21y =162

Answer 1

use substitution method to solve

Answer 2

Answer:

21x+47y=110......1.equ.

47x+21y=162.....2 equ

add equ 1 and 2

21x+47y=110

47x+21y=162

_________

68x+68y=272

divide equ by 68

x+y=4.....equ.3

subtract equ 1 from 2

47x+21y=162

21x+47y=110

_________

26x-26y=52

divide equ by 26

x-y=2.....equ4

add equ no 3 and 4

x+y=4

x-y=2

____

2x= 2

x=2/2

x= 1

substitute x value in equ 3

x+y=4

1+y=4

y=4-1

y=3

solu:(x,y)=(1,3)..

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