Question

Which equation shows the substitution method being used to solve the system of linear equations?

x + y = 6
x = y + 5


A.
x = (x – 6) + 5

B.
(y + 5) + y = 6

C.
x + (y + 5) = 6

D.
x + y = y + 5

Answer 1

substitute the value of x into the first equation:
x + y = 6
x = y + 5

=> (y+5)+y=6 => 2y=1 => y=1/2

x+1/2=6
x=5.5


thus y=0.5 and x=5.5

Answer 2

Thank you so much (:

Answer 3

But none of them are right?... @AlexandervonHumboldt2

Answer 4

no

you need to susbtitute the value of x into first equation.
x=y+5.

substitue this instead of x: (y+5)+y=6