Question

Solve the following system of equations.

4x + 7y – 2z = 0
3x – 5y + 3z = 9
3x + 6y – z = 1


Choices:

A.(1, 0, 2)
B.(–1, 0, –2)
C. (1, 0, –2)
D.(–1, 0, 2)

Is the correct answer D?

Answer 1

Not quite notice when we substitute those values into the 2nd equation it does not equal 9

Answer 2

For these questions, as multiple choice, it can sometimes be faster just to check the answers in the equations and see which one provides true statements every time.

Answer 3

so is it B?

Answer 4

no

Answer 5

just do what simple said
see which choice holds for the system

Answer 6

plug in

Answer 7

ok

Answer 8

what happens when you check A?

Answer 9

do each of the equations hold true for (x,y,z)?

Answer 10

(x=1,y=0,z=2)*?

Answer 11

all i did was subract the second and and third equation

Answer 12

and i got -11y+4z=8

Answer 13

ok it is easier if you just plug in those values and see if each of the equations hold

Answer 14

oh so the naswer is A right?

Answer 15

answer*

Answer 16

right becasuse
4(1)+7(0)-2(2)=4-4=0 both sides =
3(1)-5(0)+3(2)=3+6=9 both sides =
3(1)+6(0)-2=3-2=1 both sides =

Answer 17

ooooh i get it thank you so much for your help i really appreciate it

Answer 18

good work. nice finish too myininaya

Answer 19

thank both so much