exam Maths Puzzle Numerical Ability

solve each system by graphing

3x-6y=9
x-2y=3

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exam Other Question

Use the following tabe to answer the question.
Population of Europe by Age Groups
Population (in thousands)
1950 1970 1995
Age 0-14 143,175 166,367 139,464
Age 15- How do I determine which two equations represent perpendicular lines? (a) y = 4/7x - 3 (b) y = 3x -4/7 (c) y = -1/3x + 4/7 (d) y = 1/3x - 4/7?