T Tahmina New member Messages 6 Reaction score 0 Jun 13, 2009 #1 is anyone gd at quadratics i hav my summer exams next next i need help on this question Make X the subject of the formula y= 3x+4 divide by x-3 ta
is anyone gd at quadratics i hav my summer exams next next i need help on this question Make X the subject of the formula y= 3x+4 divide by x-3 ta
G GreyKode IB Veteran Messages 718 Reaction score 93 Jun 13, 2009 #2 Tahmina said: is anyone gd at quadratics i hav my summer exams next next i need help on this question Make X the subject of the formula y= 3x+4 divide by x-3 ta Click to expand... I can try to help out if you could only clarify the question.
Tahmina said: is anyone gd at quadratics i hav my summer exams next next i need help on this question Make X the subject of the formula y= 3x+4 divide by x-3 ta Click to expand... I can try to help out if you could only clarify the question.
A alcurad IB Expert Messages 2,001 Reaction score 468 Gender Male Religion Islam Jun 13, 2009 #3 you mean as (x=) instead of (y=) then divide by (x-3) ? I don't understand the last part, but here goes: consider / as division, then: y = 3x + 4 y - 4 = 3x + 4 - 4 (y - 4) / 3 = 3x / 3 (y - 4) / 3 = x I hope that helped
you mean as (x=) instead of (y=) then divide by (x-3) ? I don't understand the last part, but here goes: consider / as division, then: y = 3x + 4 y - 4 = 3x + 4 - 4 (y - 4) / 3 = 3x / 3 (y - 4) / 3 = x I hope that helped
~Raynn~ Esteemed Member Messages 205 Reaction score 28 Jun 13, 2009 #5 ^ Okey dokey, in which case... y = (3x + 4)/(x - 3) (x - 3)y = 3x + 4 .....[multiply both sides by x - 3] xy - 3y = 3x + 4 .....[expand the brackets] xy - 3x = 3y + 4 .....[bring all the x terms on one side] x (y - 3) = 3y + 4 .....[take out a factor of x] x = (3y + 4)/(y - 3) .....[divide both sides by y - 3] Hope that helps!
^ Okey dokey, in which case... y = (3x + 4)/(x - 3) (x - 3)y = 3x + 4 .....[multiply both sides by x - 3] xy - 3y = 3x + 4 .....[expand the brackets] xy - 3x = 3y + 4 .....[bring all the x terms on one side] x (y - 3) = 3y + 4 .....[take out a factor of x] x = (3y + 4)/(y - 3) .....[divide both sides by y - 3] Hope that helps!
A alcurad IB Expert Messages 2,001 Reaction score 468 Gender Male Religion Islam Jun 13, 2009 #6 ah i see, then is it (3x-4)/(3-x) or just 3x-[4/(3-x)]?
~Raynn~ Esteemed Member Messages 205 Reaction score 28 Jun 13, 2009 #7 ^ Nope, nope, that's exactly right! And if you take out a factor of -1 in both the top and bottom, and cancel them out, you get the same form...but it kinda looks nicer with less -ve signs, lol .
^ Nope, nope, that's exactly right! And if you take out a factor of -1 in both the top and bottom, and cancel them out, you get the same form...but it kinda looks nicer with less -ve signs, lol .
~Raynn~ Esteemed Member Messages 205 Reaction score 28 Jun 13, 2009 #8 :giggling: Terrrible...not that it makes any difference whatsoever, of course, lol...