What is the solution to the system? 1) 3x+y+z=7 2) x+3y-z=13 3) y=2x-1 a) (3, 2, −2) b)(7, 13, −1) c) (−2, 3, 2) d)(2, 3, −2)

D) (2, 3, -2)

Step-by-step explanation:

For a question like this, it is often easiest just to check the answers to see which works. The easiest equation to use for that purpose is the one that has only two variables: y = 2x-1. Only selections B and D are successful in that equation.

Selection B doesn't work in equation (2), leaving answer D as the best choice.

D

Step-by-step explanation:

1) 3x+y+z=7 1

2) x+3y-z=13 2

3) y=2x-1 3

Put y= 2x-1 in eqn 1 and 2

3x +2x-1+ z =7

5x +z =84

x+3(2x-1)-z =13

x + 6x -3-z = 13

7x-z = 165

Solving eqn 4 and 5 by elimination method, Add both equations

12x = 24

x = 2

y= 2x-1

y = 4-1 = 3

Put y = 3 and x = 2 in eqn 2

2+3×3-z=13

2+9-z =13

-z = 13-11=2

z =-2

The values are (2,3,-2)

the answer is 9.8975

explanation:

when you multiply the "39.59" with the 25% it reduces it and shows its final discounted price. hope this !

step-by-step explanation:

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