exam Maths Puzzle Numerical Ability

Solve following systems of linear inequalities graphically

15x+20y<300
x+y<18



Don't understand this problem at all.

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exam Other Question
1.) A company sells 375 scissors fo $562.50. Expenses total
$395.75. How much profit is made from each pair of scissos?




Thanks fo the help!!! There are 3 vectors a, b, c which do not belong to the same level, and k, l, m are known real numbers. Find the ventors u,v, if:
a*u=k, b*u=l, a*v=m, u x v=c.

(generally:
a*b=