Question

Ayo buys supplies for the school's greenhouse. He buys f bags of fertilizerand p packages of soil. He pays $5 for each bag of fertilizer and $2 for eachpackage of soil, and spends a total of $90. The equation 5f + 2p = 90describes this relationship. If Ayo solves the equation for p, which equationwould result? *

Answer 1

f = fertilizer

p = soil

5f + 2p = 90

Subtract 5f from each side

5f+2p-5f = 90-5f

2p = 90-5f

Divide each side by 2

2p/2 = ( 90-5f)/2

p = 90/2 - 5f/2

p = 45 - 2.5f

Answer: p = 45 - 2.5f