Can they buy 15 bags of fertilizer and 4 bags of peat moss?

Translate to a system of inequalities and solve.
A gardener does not want to spend more than \(\$ 50\) on bags of fertilizer and peat moss for their garden. Fertilizer costs \(\$ 2\) a bag and peat moss costs \(\$ 5\) a bag. The gardener's van can hold at most 20 bags.