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I NEED A BIT, WELL A HUGE, HELP!!!!!!!!!!!!!


Sternly

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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

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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: )

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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

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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:

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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:)

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