Sternly Posted March 9, 2004 Share Posted March 9, 2004 WELL I HAVE SOME SIMULTANEOUS EQUATIONS, AND I DID MOST OF THE EXERCISES, BUT I HAVE 2 LEFT AND THEY ARE NOT COMING OUT! :angry: (i) 5x + 4y = -22 3x - y = -3 (ii) 3x + 2y = 2 2x - 6y = -12 THE SECOND ONE IN FACT IS DEAD EASY, I THINK SO, BUT I'VE BEEN WORKING ALL EVENING AND MUST CHECK SOMETHING. THE FIRST ONE IS SUPPOSE TO GIVE ENTIRE NUMBERS, BUT I'M GETTING FRACTIONS, HENCE I'VE DONE SOMETHING WRONG :/ :confused: I HOPE SOMEONE LIKE MATHS, AND CAN HELP ME! :D Link to comment Share on other sites More sharing options...
twin4life Posted March 9, 2004 Share Posted March 9, 2004 :o *backs off* Link to comment Share on other sites More sharing options...
Sternly Posted March 9, 2004 Author Share Posted March 9, 2004 MANDY IT IS VERY SIMPLE! YOU COMPARE THE FIRST LINE WITH THE SECOND LINE, AND FIND A VALUE FOR THE VARIABLES, THAT MAKES THE EQUATIONS TRUE! :D (THEORETICALLY SOUNDS EASIER, I JUST GOT PROBLEMS WITH THE SIGN STUFF AT TIMES! :angry: AND THAT 1ST EXCERSICE :dozey: ) Link to comment Share on other sites More sharing options...
StupidIntel Posted March 9, 2004 Share Posted March 9, 2004 5x + 4y = -22 3x - y = -3 3x - y = -3 y = 3x + 3 5x + 4(3x + 3) = -22 5x + 12x + 12 = -22 17x + 12 = -22 17x = -34 x = -2 5x + 4y = -22 5(-2) + 4y = -22 -10 + 4y = -22 4y = -12 y = -3 (-2, -3) I think that's what you need? Right? I'll do the other one if that's right. We just got done w/ those at school :P Link to comment Share on other sites More sharing options...
Sternly Posted March 9, 2004 Author Share Posted March 9, 2004 5x-9y = -34 2x + 3y = - 7 Link to comment Share on other sites More sharing options...
twin4life Posted March 9, 2004 Share Posted March 9, 2004 i haven't worked with negatives yet. :dozey: although we did learn something like that. but i forget all the steps and such. i'm just working on fractions now. i always forget how to add and subtract them. well we didn't have a proper teacher last year for it so i never understood it. well i did once...for about a week. :dozey: Link to comment Share on other sites More sharing options...
Sternly Posted March 9, 2004 Author Share Posted March 9, 2004 WE MAKE THEM DIFFERENTLY THO :confused: I.E: 3x + 5y = 34 3x + 7 = 44 ___________ 0 + 2y = 10 y = 5 3x + 25 = 34 3x = 34-25 3x = 9 x = 9/3 x= 3 OR WE USE MATRIXES :confused: Link to comment Share on other sites More sharing options...
StupidIntel Posted March 9, 2004 Share Posted March 9, 2004 5x-9y = -34 2x + 3y = - 7 -2 (5x - 9y = -34) 5 (2x + 3y = -7) -10x + 18y = 68 10x + 15y = -35 33y = 33 y = 1 2x + 3(1) = -7 2x + 3 = - 7 2x = -10 x = -5 (-5, 1) :) Link to comment Share on other sites More sharing options...
Sternly Posted March 9, 2004 Author Share Posted March 9, 2004 AND FOR THE SECOND ONE I GOT 5x + 4y = -22 } 3 3x - y= -3 } 5 -15x + 12y = 66 -15x + 5y = 15 _______________ 0 + 7y = -81 y = -81/7 AND I'M SURE THAT'S WRONG| :dozey: Link to comment Share on other sites More sharing options...
Sternly Posted March 9, 2004 Author Share Posted March 9, 2004 5x-9y = -34 2x + 3y = - 7 -2 (5x - 9y = -34) 5 (2x + 3y = -7) -2 from where? You haven't change the place yet, so I don't know where you are gtting that - from :confused: Link to comment Share on other sites More sharing options...
weedy_gonzalez Posted March 9, 2004 Share Posted March 9, 2004 you`re serioulsy bored :P Link to comment Share on other sites More sharing options...
Sternly Posted March 9, 2004 Author Share Posted March 9, 2004 :lol: WASN'T REALLY :P Link to comment Share on other sites More sharing options...
weedy_gonzalez Posted March 9, 2004 Share Posted March 9, 2004 you have any cool and easy equations for me? Link to comment Share on other sites More sharing options...
hippidami Posted March 9, 2004 Share Posted March 9, 2004 it is not that difficult.Just got the thing right:) there is two equations. 5x+4y= -22 3x - y= -3 just u need to do is make x or y equal. like u make y equal at first 5x + 4y =-22 4. 3x - y= -3 it makes 5x+4y= -22 12x-4y= -12 then add them +--------------- 17x=-34 x=-2 then put this x in any of the equations, then u find y:)) hope it works kiss ya Sternly:) Link to comment Share on other sites More sharing options...
CityandColour Posted March 9, 2004 Share Posted March 9, 2004 I NEED A BIT' date=' WELL A HUGE, HELP!!!!!!!!!!!!![/quote'] And I need to get laid. :rolleyes: Link to comment Share on other sites More sharing options...
Sternly Posted March 9, 2004 Author Share Posted March 9, 2004 THANKS HIPPY :D AND COLLEEN :D I DID THAT AND IT DID WORK, AFTER ALL IT JUST MY BRAIN WAS BORED OF WORKING ALL EVENING ON THAT! :sneaky: Link to comment Share on other sites More sharing options...
CityandColour Posted March 9, 2004 Share Posted March 9, 2004 What brain? :P Link to comment Share on other sites More sharing options...
StupidIntel Posted March 9, 2004 Share Posted March 9, 2004 I knew it worked. :cool: :P Link to comment Share on other sites More sharing options...
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