book Maths Puzzle Numerical Ability

If the tens digit x and the units digit y of a positive integer n are reversed, the resulting integer is 9 more than n. What is y in terms of x ?
(A) 10 - x
(B) 9 - x
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book Other Question

What is the x-intercept of the line with the equation 4x + 2y=12? Please help me, Please! a trinangle has a 121 angle and a 5 degree angle . what is the measure of the 3rd angle?