If you were to use the elimination method to solve the following system, choose the new system of equations that would result after the variable y is eliminated in the first and second equations, then the second and third equations.

3x - y + 3z = 1
4x + y - 6z = 3
4x - 2y + 3z = -3

a) 7x - 3z = 4
12x - 9z = 3

b) 7x - 3z = 4
4x - 6z = 3

c) 3x + 3z = 1
12x - 9z = 3

d) 3x + 3z = 1
4x - 6z = 3

Question

If you were to use the elimination method to solve the following system, choose the new system of equations that would result after the variable y is eliminated in the first and second equations, then the second and third equations.

3x - y + 3z = 1
4x + y - 6z = 3
4x - 2y + 3z = -3 
  
a) 7x - 3z = 4
12x - 9z = 3

b) 7x - 3z = 4
4x - 6z = 3

c) 3x + 3z = 1
12x - 9z = 3

d) 3x + 3z = 1
4x - 6z = 3

anonymous · Answer

3x - y + 3z = 1
4x + y - 6z = 3 
4x - 2y + 3z = -3 
You have these equations and want to eliminate y. 
By adding the second equation to the first and twice to the third y will be gone. 

7x-3z=4 is the first 2 added up

anonymous · Answer

andras, could help me out real quick?

anonymous · Answer

now you need to do the second and third (add twice/multiply it by 2 first)

anonymous · Answer

Sure

anonymous · Answer

What is ti?

anonymous · Answer

go to the last prob i posted (posted yesterday) and explain to me what i am doing wrong

anonymous · Answer

OK, one sec

anonymous · Answer

o k