Question

Solve the system. {x+y=12
x-y=2

Answer 1

Answer: c, 7,5

Explanation:

Answer 2

x = 7, y = 5 → (7, 5)

Explanation:

`\underline{+\left\{\begin{array}{ccc}x+y=12\\x-y=2\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad2x=14\qquad\text{divide both sides by 2}\\.\qquad x=7\\\\\text{Put it to the first equation:}\\\\7+y=12\qquad\text{subtract 7 from both sides}\\y=5`