Adam will use x black stone tiles and y gray stone tiles to cover his patio floor. Black stone tiles cost $5 each and gray stone tiles cost $4 each. He can spend up to $150 on his project, and he wants the number of gray stone tiles to be less than half the number of black stone tiles. Select all inequalities that model this situation. x>_ 0 x> 0 5x + 4y <_150 5x +4y < 150 y <1/2x y <_ 1/2x