exam Maths Puzzle Numerical Ability

You have a total of 25 coins, all nickels and quarters. The total value is $3.85. Write and solve a system of equations to find the number of nickels n and the number of quarters q that you have.

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exam Other Question
Determine which two equations represent perpendicular lines.
(a) y = 4x - 7
(b) y = x + 7
(c) y = - x + 7
(d) y = x - 7

 (graphing linear equations)
Graph each wquation by using the x-and y-intercepts.

3x-y=3