exam Maths Puzzle Numerical Ability

Help me please I can not understand this. How do you graph f(x)=-x-2.PLEASE HELP Thank you in advance.

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exam Other Question

A certain creme mixture contains 12 grams of creme A, 18.6 grams of petrolatum, and 30 grams univase. The pharmacist needs to make a 480-gram mixture containing the same ratio of ingredients. How much of each ingredient should she include? solve each sytem by graphing.

x + y = 6
x - y = 2