OpenStudy (anonymous):

Part 1 (3 points) : When solving systems of equations, how do you determine what method to use? Part 2 (10 points) : Choose 1 system of equations from the choices below. Then, solve the system and post your solution, showing your steps so that other students can see which method you chose. –y + 3x = 6 y = –6x + 12 6x – 4y = 54 –9x + 2y = –69 2y = x + 1 –2x – y = 7

6 years ago
OpenStudy (farmdawgnation):

chrissyj, do not continue reposting the same question over and over again. Feel free to ask for more attention in chat if you feel you need it! Thanks, and welcome to OpenStudy!

6 years ago
OpenStudy (turingtest):

1. when at least one of the variables has the same coefficients in both equations or is an simple multiple of the same variable in the other equation, then elimination is a good strategy. When one of the variables can be easily isolated into a simple expression, then substitution is a good strategy.

6 years ago
OpenStudy (turingtest):

I'll give the first steps of the rest: 2. substitution: –y + 3x = 6 y = –6x + 12 substituting the second equation into the first we get -(-6x+12)+3x=6 which can be solved for x after finding x you can use the second equation above directly to find y

6 years ago