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MATH HELP 5

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asked Aug 3 in ALGEBRA 1 by anonymous

1 Answer

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2.1.1

Step 1:

The system of equations are

Convert the equations into matrices form image,

where image is coefficient matrix, image is variable matrix and image is constant matrix.

Solve the equations by using Cramers Rule.

Since image Cramers Rule is applicable.

Step 2:

image

image

image

image

Solution:

image

2.1.2

Cofactor of -3 is 18.

answered Aug 4 by Anney Mentor

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