1. suppose a friend has just given you $25. this increased your total amount of cash to
$45. how much money did you start with?
step 1: define the variable. (hint: the variable shown is the first letter of the word it
defines.) (2 points)
m
=
step 2: write an equation to describe the situation using the variable defined in step 1.
(2 points)
step 3: solve the equation you wrote in step 2. (hint: use the reverse operation
performed to m.) show your work. (2 points)
step 4: explain the solution you found in step 3. (2 points)