Question

Solve the system of linear equations using linear combination.

3a + 6b = 45

2a – 2b = –12

Which is the solution to the system?

Answer 1

multiply the second equation all the way across by \(3\)
then add the two equations in a column

Answer 2

6a - 6b = -36

Answer 3

a=15-2b

Answer 4

a=b-6

Answer 5

ok good
you got \[3a + 6b = 45 \\2a – 2b = –12\] and turned it in to
\[3a+6b=45\\
6a-6b=-36\] now add them up

Answer 6

what do you get when you add?

Answer 7

9a = 9

Answer 8

k good
and that tells you \(a=1\)

Answer 9

Its either two answers a=1, or its 9 or its -39