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A dump of our free Chat sessions, in case it is useful. It excludes white boards used during paid sessions.

tutordj_a : How May I help You With Statistics Problems?
student : need help with math
tutordj_a : question please
student : 2a+4b=-24
student : a=20-2b
tutordj_a : Ok
tutordj_a : 2a+4b=-24 -----(1)
student : we are using the substitution method
tutordj_a : a=20-2b or a+2b=20---(2)
student : okeay so we dont use a=-2b+20
tutordj_a : you can use it also
tutordj_a : like that
student : okeay
tutordj_a : 2a+4b=-24 substitute the value of a we get
tutordj_a : 2(20-2b)+4b=-24
tutordj_a : or, 40-4b+4b=-40
student : its ok
tutordj_a : sorry 40-4b+4b=-24
student : ok thats wht i have
tutordj_a : -4b+4b =0
student : correct
tutordj_a : So, soln is not possible
student : wht
tutordj_a : If it is 0 then how you find the value of b
student : by subtracting 40 to both sides
student : u there
student : is the tutor there
tutordj_a : yes
student : ok
student : so the answer is no solution
tutordj_a : yes
student : ok
student : can u help me with more mathproblems
student : can you help me with more math problems
student : u there
tutordj_a : Please note, due to lack of resources, we can only do 1 problem FREE in 24 hours period. You can always come back tomorrow for another free problem. Please, tell your friends about our free service - 1 free in 24 hours
student : ok
student : u suck than
student : thats stupid

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