Question

Solve using two different methods. Explain which method you found to be efficient.

A. 3x-9y= 3 B. 7x-3y= 20 C. y=1/2x-6
6x-3y= -24 5x+3y=16 2x+6y= 19

Answer 1

B elimination method add term by term

7x-3y=20
5x+3y=16
-----------
12x 0 =36
x=36/12 =3

x=3

hope you can continue it

Answer 2

A. multiplie first equation by -2 and will get

-6x+18y=-6
6x-3y=-24
------------- assum it
0 15y=-30
y=-30/15=-2

y=-2

hope so much that you will can continue it

Answer 3

C. substitute the value of y from the first equation in place of y in second equation

good luck

bye hope that i was in your help

Answer 4

Thank you for your help it helped me a little bit more

Answer 5

which one would you like to do?

Answer 6

I have to do all three of them...

Answer 7

well I can't show you how to do all three both ways, but I think I have time to walk you through one
hopefully that will help you do the others

Answer 8

so pick one...

Answer 9

ok thank you

Answer 10

C

Answer 11

multiply the first equation by 2
what do you get ?

Answer 12

idk i am so confused.........?

Answer 13

sorry, I meant to say 4
y=1/2x-6
2x+6y=19
multiply the first equation by 4 and you get
4y=2x-24
2x+6y=19

now get the first equation arranged so that x and y are on the left side of the equation, and the constant -24 is on the right

Answer 14

Oh okay