Solving Systems of Equations using Matrices and Inverses HSA.REI.C.9 Grade Practice Test Questions TOC | Lumos Learning

Solving Systems of Equations using Matrices and Inverses HSA.REI.C.9 Question & Answer Key Resources Lumos StepUp ACT Practice Program - Mathematics

Lumos StepUp ACT Practice Program - Mathematics Solving Systems of Equations using Matrices and Inverses

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Grant was asked to give the inverse of the following matrix \(\left[ \begin{array}{cc} 3 & 6 \\ 1 & -7 \end{array} \right].\) His answer was \(\left[ \begin{array}{cc} -7 & -6 \\ -1 & 3 \end{array} \right]. \)This is incorrect for the inverse matrix. What was Grant's mistake and give the correct inverse matrix?

Resource: Question

Question Type: Extended Constructed Response

Standard(s):HSA.REI.C.9

Standard Description: (+) Find the inverse of a matrix if it exists and use it to solve systems of linear equations (using technology for matrices of dimension 3 × 3 or greater).

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