Question

Please Help Me It Is Very IMPORTANT!! :)
Thank You

Answer 1

When solving systems of equations, how do you determine what method to use?

For the next can you please help me solve it and what all you did please

Answer 2

here is the problem

6x - 4y = 54
-9x + 2y = -69

Answer 3

You generally look at what method will be the easiest/fastest to do.

Answer 4

With that equation, you can see that the y coefficients are two and 4. So, it looks like a minor effort to just multiply the one equation by two, and adding them together to eliminate the y-variable

Answer 5

I would do elimination but Cramer's rule is one of the fastest way to solve the system

Answer 6

Thank You but you can please help me on the problem too

Answer 7

Can you also tell what you did like step by step please and thank you :)

Answer 8

Sure.

First multiply the second equation by 2:


x2: -9x + 2y = -69 ---> -18x + 4y = -138

List the two equations and add:

6x -4y = 54
-18x + 4y = -138
__________________
-12x + 0y = -84

-12x = -84

x = 7

Now sub x back into any of the equations:

6(7) - 4y = 54

42 - 4y = 54

4y = - 12

y = -3

so x=7 and y = -3

Answer 9

you know how like on the second thing that you did well what goes in the middle of 6x - 4y

Answer 10

I can just use this and this is correct right??

Answer 11

nothing, I just spaced it so it is kinda in the same line of sight

Answer 12

yes, you can. It's correct.

Answer 13

thank you soo much

Answer 14

wait what proccess is this??

Answer 15

substittution??? haha i spelled it wrong lol

Answer 16

Nope this is elimination. My pleasure

Answer 17

Okay thank you