Answer:
2
Explanation:
Let x = number of items Steve sells
Let y = salary earned
Create two equations:
Vacuum sales: y = 500 + 100x
Encyclopedia sales: y = 300 + 200x
Equal the equations and solve for x to find the number of items Steve needs to sell for the two salaries to be the same:
500 + 100x = 300 + 200x
Subtract 300 from both sides: 200 + 100x = 200x
Subtract 100x from both sides: 200 = 100x
Divide both sides by 100: 2 = x
Therefore, Steve would have to sell 2 items for the two salaries to be the same.