Question

For each equation below, solve for x. Sometimes the easiest strategy is

mental math.
2x-3.25= 7.15

Answer 1

x=5.2

Explanation:

This is a little hard to understand in words, so look at the attached image.

You want to start by isolating the variable. This means moving -3.25 to the other side of the equals sign. To do this, you would use inverse operations, because -3.25 is a negative, you would add it to both sides of the equation. Adding 3.25 on the left side of the equation would cancel it out with -3.25 so it would just be 2x. Adding 3.25 to 7.15 would give us 10.40.

The current equation is 2x=10.4. To isolate the variable from the constant, 2, you would divide both sides by 2. 2x/2=x. 10.4/2=5.2. x=5.2