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Marcus earns money from feeding cats and answering emails. He earns $7 a week for each cat he feeds and $0.20 for each email he answers. Marcus answered 140 emails and earned $49 last week.



Part A: Create an equation that will determine the number of cats he fed. (3 points)



Part B: Solve this equation justifying each step with an algebraic property of equality. (6 points)



Part C: How many cats did Marcus feed last week? (1 point)

Respuesta :

Let c=cats, e=emails, i=income
Given: e=140, $7 per cat, $.20 per email, i=$49
A. 7c +.20e=i
7c+.20e-.20e=i-.20e ( subtraction property)
7c=i - .20e
7c/7=i/7 - .20e/7 (division property)
c=i/7 - .20e/7

B. c= i/7 - .20/7
c=(49)/7 - (.20 (140))/7 ( substitution)
c=7-4
c=3

C. Cats=3

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