exam Maths Puzzle Numerical Ability

Solve by elimination:

2x+3y=21
5x-2y=-14

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exam Other Question

1-2cosL+cos2L= ?
L is alpha and please if anyone can explain it to me i would be grateful. Write a formula that expresses the relationship described below
y varies directly as x and y = �10 when x = �7.

What are the key words that I should notice that helps me write formulas?....I know y = ?/?