exam Maths Puzzle Numerical Ability

I really can not understand this problem could someone please help me.The question is from a worksheet.Rewrite the equation 4x-10y=11 as a function of x.Please help me thank you in advance

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exam Other Question

ankit is now 9 yrs older thn bobby.in 10 yrs ankit will be twice as old as bobby was 10 yrs ago.find their age i tried this sum plenty of times but i didnt get it right please help me and thanks
Each question of a 5-question multiple choice exam has 3 possible answers. Suppose a student picks an answer at random for each question. Find the probability the student selects the correct answer on none of the questions.