exam Maths Puzzle Numerical Ability

Will you please help me solve the following problem:
square root x-1=x-7
answer choices:
a. 5
b. 10
c. (1, 2) These are the squiggly parenthesis

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exam Other Question

Solve the system of linear equations by the substitution method.

y = -4/3x

4x + 2y = 3/4 the perimeter of a rectangle is twice the sum of its length and its width. the perimeter is 34 meters and its length is 2 meters more then twice its width. What is its length?