# Algebra, help needed

posted by .

I need help I don't know how to solve this system

Solve the following system. Show all your work

3x-2y+2z= 30
-x+3y-4z= -33
2x-4y+3z= 42

• Algebra, help needed -

what makes it especially difficult? You must have solved similar systems already.

2(1st)+(2nd) and 3(1st)-2(3rd):
5x - y = 27
5x + 2y = 6

Now it gets easier:
3y = -21
y = -7

so,
x = 4
z = 2

• Algebra, help needed -

every time i try adding two equations that could make it simpler ex; by adding and crossing out variables. i just could never get it right and still have those three same variables thx for the help

• Algebra, help needed -

Yeah, it takes a bit of practice. Look for LCMs to get rid of stuff. In this case, since 3*2=6, we had to take 3 times the 1st to get 6 and 2 times the 3rd to get 6.

Usually the errors come in watching the other coefficients. In the beginning, it helps to write everything down so details don't get lost.

• Algebra, help needed -

23

## Similar Questions

1. ### Algebra

Solve the system of equations using substitution. x + 4y = -5 3x - 8y = 45 When I tried to solve it, I got x=-17 and y=-3. When I plugged these into the first equation, it didn't work out at all. Could someone please show me the steps …
2. ### Math - Real number system

Solve the following equation in the real number system. Please show all of your work. x^4 + 6x^3 + x^2 - 24x - 20 = 0 Help!!!!
3. ### college algebra

Solve the following equation in the real number system. Please show all of your work. 2x^3-3x^2-14x+15=0
4. ### college algebra

Solve the following equation in the complex number system. Please show all of your work. 2x^5-3x^4-32x+48=0
5. ### Intermediate Algebra

Solve using elimination method. If the system has no system or infinite number of solutions, state this. Please show all work. I need to show how I came about my answer. I need this as soon as possible please. I would appreciate any …
6. ### college algebra--need help please!!

solve the equation in the real number system. 2x^4-23x^3+75x^2-88x+28=0 What are the real solutions of the equations?
7. ### Math

6x-4y=54 -9x+2y=-69 Which system would work best to solve?
8. ### Algebra

I need help I don't know how to solve this system Solve the following system. Show all your work 3x-2y+2z= 30 -x+3y-4z= -33 2x-4y+3z= 42
9. ### Algebra

Solve the system of equations and check your solution. x^2+y^2=25 x+2y=10 I tried but I got only the 2 x values 8 plus or minus the square root of 164 all over 2. I know the answer is wrong but I can't find my mistake. Can you show …
10. ### Algebra

7x + 5 = y 3.5x + 20 = y Solve the system of equations. What method did you use to solve the system and why?

More Similar Questions