SOLUTION: hi, i really need help with this. find the numerator for the y variable when using cramer's rule to solve x-3y=8 and 2x+2y=8. thanks a bunch!!

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Question 109445This question is from textbook algebra2 with trigonometry
: hi, i really need help with this. find the numerator for the y variable when using cramer's rule to solve x-3y=8 and 2x+2y=8. thanks a bunch!! This question is from textbook algebra2 with trigonometry

Answer by jim_thompson5910(35256)   (Show Source): You can put this solution on YOUR website!
First set up a coefficient matrix:



Now find the determinant of the matrix



So to find the y solution, simply replace the second column of the coefficient matrix with the column to get the new matrix




Now find the determinant of this new matrix




Now divide the determinant of B by the determinant of A to get




So the solution for y is -1 (ie )

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