Hello,
Answer: 180-(3x)
Step-by-step explanation: Since our current weight is 180, we need to write "180-" at the beginning of the formula. Since we will lose three kilograms every week, we write "x" for the number of weeks. Since we lose 3 kilos every week, we multiply x by three. Thus, no matter what value you give to x, we find out how much weight we will lose after that many weeks.
Example:
If we want to know how much we will weigh after 10 weeks, let's substitute this into the formula.
The result will be 180-(3.10) = 180-30 = 150.
Note: I called the unit of weight kilo because of the region I live in. You can change this unit according to your country. The formula and result will not change.
Good lessons :)