Question

using substitution method 2x+8y=33 and x+7y=23

Answer 1

2x+8y=33 -----1

x+7y=23 -----2

2x=33-8y

x=33-8y/2

substituting value of x in 2

33-8y/2+7y=23

-8y+7y/2=23-33

-y/2=-10

y=2*10

y=20

substituting value of y in equ 2

x+7*20=23

x+140=23

x=23-140

x=-117