Question

If x + 7 = 9, then x ≠ 8.
If we were to use an indirect proof to prove this statement, then what would we assume true?

a. x = 8
b. x + 7 ≠ 9
c. x ≠ 8

Answer 1

A.x=8
     $x_{123} \left \{ {{y=2} \atop {x=2}} \right. \beta \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right]$
             ⇒∛2.9647539866734↔7=α