Question

Use the elimination system of linear equation.(my three key is broke..)
a+7b=1
a+ three b= negative three

Answer 1

This is like the two we already did isnt it?

Answer 2

yeah bu this has mor letters like the other ones had letters with the number

Answer 3

Ok you wanna eliminate one of the variables so lets multiply the first equation by -1. so now we have:
-a-7b=-1
a+3b=-3

now add the equations together and solve for b.

Answer 4

ok so i add 7b to negative three

Answer 5

because i believe -a and a is canceled out

Answer 6

No you add the like terms. straight down.
youll get:
-4b=-4

Answer 7

oh ok 7 minus negativ three and 1+ three ok

Answer 8

b=1

Answer 9

i divided

Answer 10

Yep. Now that you know b, plug it in to one of the original equations and solve for a

Answer 11

so, i place 1 for a

Answer 12

No you put in 1 for b.

Answer 13

a+7(1)=1

solve for a

Answer 14

it seems to be three and 7 for th solution becausee the letter a in this equation is 1

Answer 15

correction (1,7)

Answer 16

You should get -6 for a.

Answer 17

7(1)=7 so minus 1= 6

Answer 18

-6

Answer 19

(1,-6)