SOLUTION: Solve the system by graphing and then get an exact solution by using either substitution or elimination :
2x - y = -1
6x + 3y = 0
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Question 64832This question is from textbook An Incremental Development
: Solve the system by graphing and then get an exact solution by using either substitution or elimination :
2x - y = -1
6x + 3y = 0
This question is from textbook An Incremental Development
Answer by rchill(405) (Show Source): You can put this solution on YOUR website!
. From the graph, it appears the lines intersect at (-1/4, 1/2), but can't tell for certain. So you will need to solve by adding the two equations together or by substitution. Using the latter, the first equation becomes y=2x+1, so use that in the 2nd equation thusly: 6x+3(2x+1)=0, which simplifies to 6x+6x+3=0, which further reduces to 12x=-3, and finally . Using that value of x in the first equation, we get .
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