book Maths Puzzle Numerical Ability

I'm supposed to graph 2y-4x<8 but dont know how to find the x and y points.

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book Other Question

The units of a two-digit number is 1 less than the tens digit. Nine times the tens digit is less than the number with the digits reversed. Find the least such number. Find the values of the polynomials for the given value of the variable

-x^2 - 5x - 6

when x = -2

I get confused when substituting -2 for the first value when it is a negative x^2