Perform an operation on the given system that eliminates the indicated variable. write the new equivalent system.
2x + y − 4z = 4, 2x + 4y + z = 15, 6x − 5y − z = 7
eliminate the x-term from the third equation.

8y-11z=5

Step-by-step explanation:

2x + y − 4z = 4, A

2x + 4y + z = 15,B

6x − 5y − z = 7C

Solving A to find the value of x

2x= 4-y+4z

x=4-y+4z/2D

Putting D in C

6(4-y+4z/2) -5y -z=7

3(4-y+4z) -5y-z=7

12-3y+12z-5y-z=7

12-8y + 11z=7

-8y +11z= 7-12

-8y +11z= -5

8y-11z=5E

$450.00 for 6 weeks

or

$300

step-by-step explanation:

$200.00 for first week $50.00 x5 equals $250 plus $200 equals $450.00 for six weeks.

$200 for first week

$200 x 0.10 = $20

$20 x 5 = $100

$200 + $100 = $300