PLease help :)
x – 2y + z = 0
2x – 3y – 4z = –9
x + 2y – 5z = 0
Explain, which method you would use to solve the following system of equations. And also how you solved it. :)

Question

PLease help :) 
x – 2y + z = 0 
2x – 3y – 4z = –9 
x + 2y – 5z = 0 
Explain, which method you would use to solve the following system of equations. And also how you solved it. :)

anonymous · Answer

Best way to solve it is to use elimination

anonymous · Answer

for a quiz/test?

anonymous · Answer

nope it's an assignment though.

ghazi · Answer

you can use determinant method to solve these

anonymous · Answer

cramer

anonymous · Answer

Thankyou, I dont know that method, could you explain?

anonymous · Answer

http://www.analyzemath.com/Tutorial-System-Equations/cramers_rule.html

ghazi · Answer

or else you can use method of elimination to solve above equations

eamier · Answer

i think elimination easier.

anonymous · Answer

hmmmmmm.

eamier · Answer

first maybe you can eliminate y, ①- ③.  2x-4z=0　　→④
then using 1st eq and 2nd eq eliminate y, ②*2-①*3.  x-11z=-18→⑤

eamier · Answer

then ④/2 - ⑤, 9z=18. 
you get z, so now you need to find x and y only after substitute z.