Some friends decided to go to the aquarium together. Each person pays $7.50. Solve 7.5x + 40 = 70 to find how many people

Mathematics

2 answers:

Naddika [18.5K]4 years ago

8 0

7.5x + 40 (-40) = 70 (-40)

------------------------------------

7.5x/7.5 = 30/7.5

Take out 7.5x/7.5

Divide 30 and 7.5 which equals 4

4 people went to the aquarium

I learned this when I went to school... Forgot some steps so correct them!!! :)

In-s [12.5K]4 years ago

4 0

7.5x + 40 = 70

Note the equal sign. What you do to one side, you do to the other. Isolate the x. Do the opposite of PEMDAS.

First subtract 40 from both sides

7.5x + 40 (-40) = 70 (-40)

7.5x = 70 - 40

7.5x = 30

Next, divide 7.5 from both sides

7.5x/7.5 = 30/7.5

x = 30/7.5

x = 4

4 friends are going to the aquarium together

hope this helps

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