Question

x + y = 7

x + y = 6



What is the solution of the system shown?

(6, 12)
( , 14)
(10 , 5)

Answer 1

66

Answer 2

\[\begin{cases}x + y = 7\\ x + y = 6 \end{cases}\]

from the first equation we can write that:

\( x + y = 7 \Rightarrow x=7-y \)

lets plug that information in the second equation:
\[ x + y = 6 \]
\[ 7-y + y = 6 \]
\[ 7=6 \]
\[ 0=6-7 \]
\[ 0=-1 \]
this has got no solution...