simultaneous equation

Question

3x+2y=14 and 2x+3y=21   

Answer 1

HELLO AGAIN,

 

3x + 2y = 14 ..................1

 

2x + 3y = 21 ....................2

 

multiply equation 1 by  2 and equation 2 by 3

 

and you will get

 

6x + 4y = 28  .....................................3

 

6x + 9y = 63........................................4

 

subtract equation 3 from 4 

 

6x +4y = 28

6x + 9y = 63

--------------

0 +5y =35

 

so y = 7

 

plug in y = 7 into any equation you like to get x

 

3x + 2y =14 becomes  3x +14 =14

 

x =0 , y =7

 

 

 

 

Answer 2

Isolate x in one of the equations and then plug that in for x in the other equation to solve for a value for y. Then plug that y value into either equation and you'll have the x value.