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Age 11 to 14 Challenge Level:

For each of the pairs below, there are whole number multiples that combine to give $5x + 8y$:

$$(x + y) \quad (x + 2y)$$$$(x + y)  \quad (x + 4y)$$$$(x + 2y) \quad (2x + 3y)$$$$(2x + 3y) \quad (x + y)$$$$(x – 2y) \quad (x + 4y) $$$$(x + y) \quad (x – 2y)$$$$(x + 2y) \quad (x + 4y)$$