Question

Solve 2x-y=4,y+2x=8 by substitution method ​

Answer 1

Answer:

2x-y=4.........(1)

2x+y=8.........(2)

by taking equation (1)

• x=4+y/2

putting the value of 'x' in equation (2)

• 2x + y = 8
• 2(4+y/2) + y = 8
• 8+ 2y /2 + y = 8
• 8 + 2y + 2y/2 = 8
• 8 + 4y = 16
• 4y = 8
• y = 2

putting the value of 'y' in equation (3)

• x = 4 + 2/2
• x = 4 + 1
• x = 5

Step-by-step explanation:

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Answer 2

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2x-y=4-----(1)

2x=4+y

x=(4+y)/2

y+2x=8-----(2)

putting the value of x in (2):

y+2((4+y)/2)=8

y+4+y=8

2y+4=8

2y=4

y=2

x=(4+2)/2

x=6/2=3

so, x=3, and y=2

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