Write A Real-world Problem That Can Be Modeled By 1/2x - 2 = 8

Question

 please help me with this, i don't understand what to write

 

Answer 1

Here's an example but I don't know that's its "real world". Another tutor might have a better one.

 

A very small container of antifreeze (maybe and ounce) is moved into a hot room. The temperature of the antifreeze rises 1/2 degree every minute that goes by. If the starting temperature of the antifreeze is -2°, after how many minutes will the temperature by 8°?

 

the 1/2 represents the rise in temperature

 

the -2 represents the starting temperature

 

solving for x:

 

1/2x - 2 = 8

 

1/2x = 10

 

x = 20

 

After 20 minutes, the temperature of the antifreeze will be 8°

 

Here's another example:

 

4 years ago when Mary was 8, she was one half the age of her brother. 

 

How old is her brother now?

 

x = brother's age

 

1/2(x - 4) = 8

 

1/2x - 2 = 8

 

this would be the 2nd step in solving this problem and gives you that equation but I think the first example is a better scenario

 

1/2x = 10

 

x = 20

 

The brother is 20 years old now.