book Maths Puzzle Numerical Ability

I am sooo lost the question is this determine the correct half-plane in each case. x+y<5

Thank you so much
Brandi

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book Other Question

i would like to know what is a
nuamrical expretion , algperic expretion
and all the proprties
ex:additive properties , multuplactiv proprties , assoiative properties ,
addit Gowdy invested $2400 in the common stock of one company and $1280 in the stock of another. The price per share of the second was four-fifths the price per share of the first. The n