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anonymous
 4 years ago
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
10x+5y=52.5
30x7y=80.5
anonymous
 4 years ago
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 10x+5y=52.5 30x7y=80.5

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0multiply the first by 3, add to the second

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0ok now is the second part or the whole thing

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0ok i messed up yet again so let me start afresh

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0\[10x+5y=52.5\] \[30x7y=80.5\] multiply top by 3 get \[30x15y=157.5\] \[30x7y=80.5\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0add the two equations together. the x's add up to zero and you get one equation in y, namely \[22y=77\] solve for y and get \[y=\frac{77}{22}=\frac{7}{2}=3.5\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0now that we know y, replace y by 3.5 in either equation and solve for x

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0\[10x+5y=52.5\] \[10x+5\times 3.5=52.5\] \[10x+17.5=52.5\] \[10x=35\] \[x=3.5\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0so both x and y are 3.5 it doesn't usually work out that way
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