Question

Help with matrices?

Answer 1

metric

Answer 2

what?

Answer 3

Autumn, I think you need to understand the concepts with matrices, and then you can easily solve them yourself. How about we learn that together instead of answering this specific question?

Answer 4

I don't have time for that... I'm stressing out I need to get through this as soon as I can

Answer 5

Well it defeats the purpose of an education then doesn't it? What's the point of even doing it if you'll never apply it... Alright good luck.

Answer 6

Since you're given a list of choices, you can check each choice by plugging them into the equations. If you get 3 true equations, then that point is the solution.

Answer 7

So let's say we pick on choice D (I'm just randomly picking an answer choice)

(-4,2,-4) means x = -4, y = 2, z = -4


Check equation 1:

3x + y - 4z = -30

3(-4) + 2 - 4(-4) = -30 ... plug in x = -4, y = 2, z = -4

6 = -30 ... this is false


Since the last equation is false, this means that (-4,2,-4) does NOT make the first equation true. So it doesn't make the entire system true. That's why we can eliminate D as an answer choice.

Answer 8

oh good idea thank you @jim_thompson5910

Answer 9

np and keep in mind that the goal is to make all 3 equations true

Answer 10

I got it, the answer was C

Answer 11

Thank you so much guys I got 100% on that quiz! :D