Question

How did they get -1820 and I got a different answer

Answer 1

j = 9, b = 5

Explanation:

The first equation must be

`j+b=14`

Multiplying by -130 result

`-130j-130b=-1820`

we add the equations to eliminate the variable "j"

`20b=100`

`b=100/20=5`

Now we calculate "j"

`j+b=14`

`j=14-b=14-5=9`

Hope this helps

Answer 2

It's because you are multiplying the wrong variables.

Explanation: