Question

substitution method x+y=4 ; 2x-5y=1 ​

Answer 1

Answer:

x = 4-y

2x-5y=1

2(4-y) -5y = 1

8 - 2y -5y = 1

8 - 7y = 1

8-1 = 7y

7 = 7y

y = 1

x = 4-y

x = 4-1

x = 3

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Step-by-step explanation:

Answer 2

Answer:

x + y = 4-------(I)

y = 4 - x

2x -5y = 1-----(II)

substituting y = 4-x

2x -5(4-x) = 1

2x - 20 + 5x = 1

2x + 5x = 1+20

7x = 21

x = 21/7

x = 3

y = 4-3

y = 1

Thus x = 3 and y = 1.