Question

Sam's height is 15 centimeters less than 2 times Martha's height. If Sam is 185 centimeters tall, and Martha's height is x, the relationship between the heights can be represented by the equation 2x − 15 = 185. What is Martha's height?

Answer 1

Solve the equation to find out
first, isolate the variable by adding 15 to both sides
2x - 15 = 185
+15 +15
------- ------
2x- 0 = 200 then simplify
2x= 200
then isolate the variable even more by dividing both sides by 2

2x=200
---- ----
2 2

you will get x=100