exam Maths Puzzle Numerical Ability

I am really having a hard time trying to figure out this problem... √ -x+7 = x-1

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exam Other Question

1/a=1/b+1/c for B can someone help me with this question:

Which common graph represents a horizontal line?

a. The constant function
b. The identity function
c. The inverse function
d. None of the above, horizontal lines are not functions