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1. When solving systems of equations, how do you determine what method to use?
2. solve the system and show your steps
2y = x + 1
–2x – y = 7
 one year ago
 one year ago
1. When solving systems of equations, how do you determine what method to use? 2. solve the system and show your steps 2y = x + 1 –2x – y = 7
 one year ago
 one year ago

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abb0tBest ResponseYou've already chosen the best response.0
You can use elimination or substitution.
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
For substitution, you can divide the first equation by 2 get your Y and substitute it.
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
\[y = \frac{ x }{ 2 } + \frac{ 1 }{ 2 }\] now you have a y, that you can use to plug in for y for the 2nd equation.
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
For elimination, you do the same method, except you are elimiating ONE variable to get just ONE, like for instance, eliminate y and get only x's. but you must have it in the form: 1. (x) + (y) = number 2. (x)  (y) = number notice how you can eliminate Y if you add both together to get: 2x = number then divide by 2 to get x. Then plug it back in and solve for Y! :)
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
You can also use gauss elimination and put it into a matrix dw:1355851242837:dw
 one year ago
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