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

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

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!!! :)

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72

step-by-step explanation:

let's assume

number of candles set =x

price of of x candles =p(x)

we are given

a candle maker prices one set of scented candles at $10 and sells an average of 200 sets each week

so, we get point as (200,10)

he finds that when he reduces the price by $1, he then sells 50 more candle sets each week

so, we can find slope

now, we can use point slope form of line

now, we can plug values

we can use point

and find b

now, we can plug it back

and we get

now, we can find revenue

we know that

revenue = price*quantity

so, we get