SOLUTION: Sue is starting a lawn-cutting business. Her start-up cost to buy two lawn mowers and an edge trimmer is $665. She has figured out that she will use about $1 in gas for each lawn.

Question 480119: Sue is starting a lawn-cutting business. Her start-up cost to buy two lawn mowers and an edge trimmer is $665. She has figured out that she will use about $1 in gas for each lawn. If she charges $20 per lawn, what will her break-even point be?

I have to use the substitution method to solve it
But I am having trouble trying to figure out the two equations
I think one equation might be 2x+t=665
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
Sue is starting a lawn-cutting business. Her start-up cost to buy two lawn mowers and an edge trimmer is $665. She has figured out that she will use about $1 in gas for each lawn. If she charges $20 per lawn, what will her break-even point be?
.
Let n = number of lawns mowed
"revenue" = 20n
"cost" = n + 665
.
Break even point is when"
"cost" = "revenue"
n + 665 = 20n
665 = 19n
35 = n
she will have to mow 35 lawns to break even
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