exam Maths Puzzle Numerical Ability

Solve the following 2 x 2 systems using substitutions
y= 1/2x + 4
y= 1/3x +5

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exam Other Question

Given f(x) = 5x^2 � 3x + 1, find f(�2).

Can someone help me out with solving this?

v/r
Jessica Devin has pennies, dimes and quarters. There are two times as many pennies as quarters. There are six times as many dimes as quarters. How many of each coin does he have?