OpenStudy (anonymous):

If you wanted to eliminate the y variable by adding the two equations in the following system, what could be your first step? 2x − 4y = 6 3x − y = 12 Add the two equations together Multiply the first equation by −4 Multiply the second equation by −4 Multiply the second equation by 4

6 years ago
OpenStudy (eyust707):

Now this one is different

6 years ago
OpenStudy (eyust707):

it uses the elimination method

6 years ago
OpenStudy (eyust707):

with this method we need the y's to have the smae number in front of them

6 years ago
OpenStudy (eyust707):

expect one y needs a -4 in front and one y needs a +4 in front

6 years ago
OpenStudy (eyust707):

that way we can eliminate them

6 years ago
OpenStudy (eyust707):

what would we want to do to make the first equation have a -4y and the second equation have a +4y

6 years ago
OpenStudy (anonymous):

so how do we change the -y to 4y ?

6 years ago
OpenStudy (eyust707):

|dw:1341347057468:dw|

6 years ago