Question

Is –7 a solution of the equation 6 + z = z + 5

Answer 1

No

Explanation:

Not only is -7 not a solution, but when solving for z:

6+z = z+5

6+z-z=5

6=5

6 is not equal to 5 so there is no solution

Answer 2

No

Explanation:

If -7 is a solution, then you could just plug z=-7 into 6 + z = z + 5.

So:

6 + (-7) = -7 + 5

-1 = -2

-1 can't equal to -2 and it will never equal. So if both sides of the equation don't equal, then -7 is not a solution.