Matrices and Row Operations Answers

When Lydia performed an operation on the matrix below, she forgot to include one element.What is the value of the unknown element, b?

Which matrix represents the solution to the system of equations below?

A student wrote the matrix below to represent the solution to a system of equations. Which of the following describes the solution?

A store sells yogurt in small, medium, and large sizes. A small yogurt costs $2, a medium costs $3, and a large costs $5. In one hour, the shop sold 27 yogurts for $98. There were five more large yogurts than small yogurts. The matrix below represents the system of equations in this situation.How many of each size yogurt did the store sell during that hour?

The matrix below represents the solution to a system of equations.Which of the following describes the solution?

Which operation can be used with the augmented matrix below?

Dante is solving the system of equations below. He writes the row echelon form of the matrix. Which matrix did Dante write?

The augmented matrix below represents a system of equations.Which matrix results from the operation ?

A shipping company charges a flat rate of $7 for packages weighing five pounds or less, $15 for packages weighing more than five pounds but less than ten pounds, and $22 for packages weighing more than ten pounds. During one hour, the company had 13 packages that totaled $168. The number of packages weighing five pounds or less was three more than those weighing more than ten pounds. The system of equations below represents the situation.Which matrix can be used to show the number of packages in the different weight classes during that hour?

A student performed row operations on a matrix as shown below.Which operations did the student perform?