grantjaylynn
07.10.2019 •
Mathematics
Anna is a kickboxing instructor who will be teaching classes at a local gym. to get certified as an instructor, she spent a total of $146. anna will be earning a base salary of $94 per month from the gym, plus an additional $13 for every class she teaches. if anna teaches a certain number of classes during her first month as an instructor, she will earn back the amount she spent on certification. how much will anna's expenses and earnings be? how many classes will that take?
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Ответ:
Let x represent the money she earn for every one class. Here I have this equation:
94(1)+13x=146
94+13x=146
13x=146-94
13x=52
x=52÷13
x=4. As a result, she will take 4 classes total in first month. Also, hers expense will be $52 and earning will be $94. Hope it help!
Ответ:
-
4x+5y=22.50
=
4x-2y=-2, so you have to divide each number by 2, then
2x-y=-1, so
-y=-1-2x /-1, y=1+2x, then replace it with one original equation like the first one for instance:
8x+3(1+2x)=20.50, then
8x+3+6x=20.50, then
14x=20.50-3
14x=17.5
x=1.25, then solve y:\
y=1+2*(1.25)
y=1+2.5
y=3.5,
So answer is x=1.25, and y=3.5