Answer:
Step-by-step explanation:
Let:
i: the cost of one pot of ivy.
r: the cost of one rose bush

From eq(1) we can get:

Substitute eq(1) in eq(2):


16x + 21y = 555
Step-by-step explanation:
Let x be the no. of 18-hole course
And y be the no. of golf balls
16x + 21y = 555
8x-41+9x+17= 180 (becuase they lie on a straight line)
17x-24=180
Move twenty four to the other side as a positive
17x=204
Divide both sides by 17
X is equal to 12