exam Maths Puzzle Numerical Ability

can you explain to me clearly what the x axis is
in 2/3+6

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i am going to a job that uses simple algebra deal in conveting factions of inches to decemial points where can i go to get help on that A vending machine will accept nickels and dimes only. The attendant checks the machine and finds 42 coins whose value is $3.40. How many coins of each type were there?