book Maths Puzzle Numerical Ability

negative 2x divded 3 less than or equal to 6.

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book Other Question

how do you find out the equation of a graph? I am having a horrible time with fractions- well, I'm having a horrible time all together, but right now it's fractions:
solve for y
x/5 + y/4=1

x/4 - y/9=1

-1/9x + 1/3y=1