Question

Based on the lesson, which of the following would be the best approach for solving this system by substitution? x-y=0 x-y-2=0

Answer 1

The answer is no solution

Answer 2

No solution

Explanation:

Which is easier to solve for either x or y? x-y=0 or x-y-2=0

I'd choose the first equation. It yields x = y. Subbing x for y in the 2nd equation yields x - x = 2. Unfortunately, we have a situation here that has no solution, since 0 = 2 is never true.