exam Maths Puzzle Numerical Ability

Can someone help me on this problem?

Is 19 a solution to the equation 10 - x = 9?

Thanks,
Sher

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exam Other Question

Rationalize the Denominator: 1/((square root of)5 - 2)

a) (square root of)5 + 2
b) (square root of)5/2
c) ((square root of)5 + 1)/2
d) (square root of)3
e) none of these could you please solve this equation using the substitution method and indicate if it is independent, inconsistent or dependent.
Thank you.

x = 1/8y - 1
y = 1/4x + 39