Question

What is the value of y if 5x - 2y = 4 and 10x -4y = 8

Answer 1

hi....
5x-2y=4
10x-4y=8

⇒4(10x-4y)=8(5x-2y)
⇒40x-16y=40x-16y

Now,'
 40x-16y=4
-40x-16y=8
_________
-32y= -4
⇒y=8
If y is 8 
then x is 4 ..

Hope this helps ;)

Answer 2

Hello !
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5x - 2y   = 4 _________(1)
MBS by 2
10x - 4y = 8__________(2)
10x - 4y = 8 _________(3)
adding 2 and 3 
20 x = 16 
     x = 16 / 20 
     x = 4/5
     y = 10 x 4/5 -8 /4 
        = 0/4 
        = 0 
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