Practice Makes Perfect--Camila wants to improve her word problem solving abilities, so she bought a whiteboard and 3 markers to practice at home. If the total cost of all items is $7.75 and the whiteboard was $4, how much did each marker cost?
a) Define a variable for the missing value.
b) Write and solve an equation to answer the question.
c) Prove that your answer is correct by substitution.
**You MUST SYW in formative**
Remember that you MUST show SUBSTITUTION to check your answer,
#1: Accurately writes and solves equation
#2: Verifies solution by using substitution