Is (5, 1) a solution to this system of inequalities?

x + 7y ≥ 12
2x + 9y ≥ 20

Convert 2000 swiss francs to dutch guilders

Antonia and carla have an equivalant percentage of green marbles in their bags of marbles. antonia has 4 green marbles and 16 total matbles. if carla has 10 green marbles , how many total marbles does carla have

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?