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4x-3y=11

10x+2y=-1

This is a simultaneous equation and i need help!! I am getting lot's of different answers plz help!!!

 Dec 14, 2014

Best Answer 

 #2
avatar+37 
+5

Thanxx Alan for the help really grateful xx

 Dec 14, 2014
 #1
avatar+33616 
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4x - 3y = 11    ...(1)

10x + 2y = -1 ...(2)

 

Multiply the first equation by 2 and the second by 3 so that there are the same number of y's in each:

8x - 6y = 22    ...(3)

30x + 6y = -3  ...(4)

 

Now add (3) and (4) term by term:

38x + 0 = 19

or

38x = 19

or x = 1/2

 

Put this back into equation (1)

4*(1/2) - 3y = 11

or

2 - 3y = 11

Subtract 2 from both sides:

-3y = 9

 

Divide both sides by -3

y = -3

.

 Dec 14, 2014
 #2
avatar+37 
+5
Best Answer

Thanxx Alan for the help really grateful xx

TassyG Dec 14, 2014

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