book Maths Puzzle Numerical Ability

y=x+5
how do i solve this
the answer is...

y is equivalent to the sum of a constant c and x, where c =5

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book Other Question

15j+10j+8=11 Can you help me understand finding the midpoint at the segment with endpoints (7,-5) and (-3,-9). I beleive that you will add 7 and -3 together and then divide.