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anonymous
 one year ago
solve the system by either elimination or substitution
3x5y=21
2x+y=1
A.2,3
B.2,3
C.2,1
D.2,1
My guess is c
anonymous
 one year ago
solve the system by either elimination or substitution 3x5y=21 2x+y=1 A.2,3 B.2,3 C.2,1 D.2,1 My guess is c

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freckles
 one year ago
Best ResponseYou've already chosen the best response.2you could multiply the second equation by 5 and then add the equations together afterwards thus eliminating the y

freckles
 one year ago
Best ResponseYou've already chosen the best response.2what would the second equation look like after multiplying it by 5?

freckles
 one year ago
Best ResponseYou've already chosen the best response.2\[2x+y=1 \\ 5(2x+y)=5(1) \\ \text{ use distributive property on the left } \\ 5(2x+y)=5\]

freckles
 one year ago
Best ResponseYou've already chosen the best response.2remember that is a(b+c)=ab+ac this is distributive property

freckles
 one year ago
Best ResponseYou've already chosen the best response.2dw:1439573529408:dw ok add the equations now

freckles
 one year ago
Best ResponseYou've already chosen the best response.2dw:1439573561932:dw

freckles
 one year ago
Best ResponseYou've already chosen the best response.2can you evaluate the following: 3+10 5+5 and 21+5

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0for the first one i got 13x=26

freckles
 one year ago
Best ResponseYou've already chosen the best response.2dw:1439573634678:dw

freckles
 one year ago
Best ResponseYou've already chosen the best response.2going back to either equation we started with we will now insert this x to find y I choose that second equation that was: 2x+y=1 2(2)+y=1 4+y=1 solve for y

freckles
 one year ago
Best ResponseYou've already chosen the best response.2dw:1439573810726:dw

freckles
 one year ago
Best ResponseYou've already chosen the best response.2yep and as you see it doesn't matter which equation you used to find the other number

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Thank you very much! can you help me with one more

freckles
 one year ago
Best ResponseYou've already chosen the best response.2sure i might be able to post a new question just in case
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