book Maths Puzzle Numerical Ability

2x+y=0
x-2y=-10
Solve using the addition or substitution method

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2. New Contract: Henry “Helicopter Cragg was negotiating a new contract with his team. He wanted $750, 000 a year and an additional $1,900 for every game he started. The team sa 4 mile ride = $3.10, 7 mile ride = $4.15, what is linear equation? How much does 12mile ride cost? How far can I go on $8?

If I tip 10% of cost, how far can I go on $10?