Question

how would you find the xyz coordinates from the equations below.

(A) 4x+2y-7z =86
(B) 6x+6y+5z=60
(C)x-8y+3z=-75

Answer 1

It is easy to do with a calculator the solves matrices, but it very time consuming to solve by hand.

But all math students have had to solve these types of equations for a very long time and you just have to gut it out and solve it by substituting two of the equations, solve for a variable, into the third equation. Just like you would do for two equations, but it gets more difficult for three variables.

I'll show you but it will take while via a computer.

Answer 2

so basically I can take equation b and c (use substitution or elimination) to get what x, y, or z , and then take a and c, get another equation

Answer 3

Yes. You need to substitute or eliminate to get to one unknown into one equation. I tried to do it on the laptop, but can't. I need to do it on paper to do it right and then type it in.

I got the answers in about 2 minutes using the calculator. Do you know how to solve equations using matrices or how to even solve a matrix?

Answer 4

nope, don't know how to do it on a calculator (or at all) that should be my next lesson in class in a few days

Answer 5

sorry os crashed. solving the matrix isn't difficult as substitution, but there is a certain procedure to follow to calculate the determinants.

I will try to show you how to solve the first one, for x....