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If the 2 lines given by the equations 12x+3y=20 and ax+y=10 don't intersect when graphed, what is the value of "a"?
 one year ago
 one year ago
If the 2 lines given by the equations 12x+3y=20 and ax+y=10 don't intersect when graphed, what is the value of "a"?
 one year ago
 one year ago

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sasogeekBest ResponseYou've already chosen the best response.1
if they don't intersect, it means they're parallel and their gradient is the same. find the gradient of the first equation and that's equal to "a" :)
 one year ago

zzr0ck3rBest ResponseYou've already chosen the best response.0
set both equal to y, and make them have the same slope
 one year ago

zzr0ck3rBest ResponseYou've already chosen the best response.0
as long as they dont have the same y intercept they will not cross if they have the same slope
 one year ago

zzr0ck3rBest ResponseYou've already chosen the best response.0
3y = 20 3x y = x(20/3) and the other equation set to y is what?
 one year ago

zzr0ck3rBest ResponseYou've already chosen the best response.0
that should be +(20/3)
 one year ago

zzr0ck3rBest ResponseYou've already chosen the best response.0
solve for y in the second equation
 one year ago

zzr0ck3rBest ResponseYou've already chosen the best response.0
y = ax+10 we want them to have the same slope so what does a need to be? y = x+(20/3) y = ax+10 a = ?
 one year ago

sasogeekBest ResponseYou've already chosen the best response.1
12x+3y=20 solve for y 3y=12x+20 y=4x+(20/3) can u tell what the slope is?
 one year ago

sasogeekBest ResponseYou've already chosen the best response.1
@mitchelsewbaran ... ?
 one year ago
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