# How To Solve Matrices Problems

You might also see a question on the ACT on adding or subtracting matrices.

Important note: you can only add or subtract two matrices of exactly the same dimensions.

When it comes to matrices on the test, you really just need to know the basics: Matrices can come in all sorts of sizes.

We write the size of a matrix first with its number of rows and then its number of columns. 3 rows and 2 columns: You might see a question on the ACT that asks you do what is called scalar multiplication.

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Then add the two products together for the determinant.

(3 × 12) (9 × 11) = 36 99 = 135 What is Matrix M × Matrix N?

## Comments How To Solve Matrices Problems

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Example 1. Solve this system of equations by using matrices. The goal is to arrive at a matrix of the following form. To do this, you use row multiplications, row additions, or row switching, as shown in the following. Put the equation in matrix form. Eliminate the x ‐coefficient below row 1. Eliminate the y ‐coefficient below row 5.…

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• ###### Algebra Examples Matrices Simplifying the Matrix Operation

Combine the same size matrices and by adding the corresponding elements of each.…

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