Question

Using elimination what is the solution of the system?
-5x - 2y = 4
3x + 6y = 6

Answer 1

you could start by eliminating the y's by multiplying the 1st equation by 3. Yes?

Answer 2

yes

Answer 3

-15x 12y=24 but what sing goes between -15x and 12y?

Answer 4

-, look at it this way 3(-5x-4y=4) is the same as 3(-5x)+3(-4y)=3(4)
3(4) is not 24 by the way

Answer 5

the answer they give are
a) (-5,10.5)
b) (-3,2.5)
c) (-1.5,1.75)
d) (1.5,0.25)

Answer 6

@emma151
rewite equation one so that you can subtract it from equation two by multiplying by 3.. waht do you get?

Answer 7

so multiply first equation by 3?

Answer 8

yes

Answer 9

-15 - 6 = 12?

Answer 10

yes but with the letters so -15x-6y=12

Answer 11

so now we have these equations:
-15x-6y=12
3x+6y=6
which term can you eliminate? the y or the x? and how?

Answer 12

@emma151

Answer 13

The 6y because they are the same now

Answer 14

yes, good.so you add the 1st equation to the second

Answer 15

write down what you get :)

Answer 16

-12x = 18

Answer 17

x=1.5 right

Answer 18

yes, now plug it into any equation and you get your y :)

Answer 19

by the way x= -1,5 since its 18/-12

Answer 20

@emma151

Answer 21

y=1.75

Answer 22

Thank you @Servet! Thnak you @bronzegoddess!

Answer 23

you are welcome :)