If you were to solve the following system by substitution, what would be the best variable to solve for and from what equation?
3x+6y=9
2x-10y=13
a)x in first equation
b)x in second equation << i think its this just making sure
c)y in first equation
d)y in second equation

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why you think so ?

well it is about which would be the best variable
to me using 2x-10=13 would be easier

you know you can first simplify 3x+6y=9
and then you would try to find which one will be easier

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