Please help Home lvy Tech commu x MyMathLab- MATH135 x y Take a Test-Ray Kim x C

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Home lvy Tech commu x MyMathLab- MATH135 x y Take a Test-Ray Kim x C chegg study 50 x IGuided Ce H l https//www.math Test aspx?testld-1543862/4 xlcom/Student/Player Sol ship Print Fvents Kelley ralend MATH135-84 Spring 2017 Quiz: MIDTERM QUIZ This Question 1 pt 24 of 33 (1 complete Solve using augmented matrix methods 3x1 -5 4x 2x2 Select the correct choice below an the answer box to complete your choice. ecessary o A. The unique solution is x1- and x O B. he system has intinitely many solutions. The solution s x1 and X Simplify your answer Type an expression using t as the variabl O C. There is no solution Click to select and enter your answers. a Search Windows Fvent In For Yoo Ray Kim 5/1217 12:01 PM Submit Quiz This Quiz: 33 pts possible 2017-U5-12.

Explanation / Answer

3x1 - x2 = -5

-4x1 + 2x2 = 6

Answer:

3 -1 | -5

-4 2 | 6

Make the pivot in the 1st column by dividing the 1st row by 3

1 -1/3 | -5/3

-4 2 | 6

Eliminate the 1st column by 4*first row- second row

1 -1/3 | -5/3

0 2/3 | -2/3

Make the pivot in the 2nd column by dividing the 2nd row by 2/3

1 -1/3 | -5/3

0 1 | -1

Eliminate the 2nd column by 1/3*second row + first row

1 0 | -2

0 1 | -1

So x = -2 and y =-1

So unique solution is x = -2 and y = -1

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