book Maths Puzzle Numerical Ability

Use a counterexample to show the following statement is false... The opposite of a number is never positive.

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book Other Question

SUPPOSE EACH ORDER PAIRS ARE FOR THE SAME DIRECT VARIATION. FIND EACH MISSING VALUE

A. (-1,2) AND (4,Y)
B. (X,-4) AND (-9,-12)

PLEASE HELP ME!!!!!!!!!!!!!! How do u solve systems of equations by elimination. Help its for my mid-term review sheet.