exam Maths Puzzle Numerical Ability

ANNA HAS 12 BILLS IN HER WALLET, SOME $5 AND SOME $10 THE TOTAL VALUE OF THE BILLS IS $100. HOW MANY OF EACH BILL DOES ANNA HAVE?

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exam Other Question

Which of the ordered pairs
(0, 0), (-2, 10), (-1, -5), (-3, 9)
are solutions for the equation y = 5x?

I am not quite sure what I am doing to confuse myself but I am getting nowhere and need some help. Thanks. Karen left her house heading east and her sister left two hours later heading west at a rate 5 mph faster than Karen. 6 hours after Karen left she and her sister were 600 miles apart. How fast was Karen moving?