book Maths Puzzle Numerical Ability

how do i write the inequality y=5-x to represent the x-values when y<2????

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x SQUARED(2) + 7 = 21 CAN YOU HELP ME SOLVE THIS EQUATION? ALSO COULD YOU EXPLAIN HOW YOU WOULD KNOW IF YOU SUBTRACT, DIVIDE OR ADD TO THE OTHER SIDE? y=Square root 3-z need to identify the any intercepts