Question

Given the equations x + y = 20 and x − y = 8, which values of x and y satisfy both equations?

A.
x = 11 and y = 9

B.
x = 9 and y = 11

C.
x = 14 and y = 6

D.
x = 6 and y = 14

Answer 1

Answer:

x+y=20

x-y=8

=2x=28

x=14

put in eq 1 we get

14+y=20

y=20-14

y=6

option c is correct

Answer 2

X +Y=20

X - Y=8

x+y+x-y=28+8

2x=28

x=14

x+y=20

14+y=20

y=20-14

y=6