Sybil can put a total mass of 950 g in her bag. She buys a book that weighs 450 g and a notebook that weighs 210 g. Write an equation to represent how much more mass, m, her bag can hold. Then, solve for the answer and include an explanation of how you solved the equation.

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]