Question

find if 2x + y = 3
when x=3​

Answer 1

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2x - y = 3 and - x + 2y = 3

To find :- (x + y)

2x - y = 3

2x = 3 + y

x = (3 + y)/2

putting value of x in equation (2)

- x + 2y = 3

- (3 + y)/2 + 2y = 3

- (3 + y ) + 4y /2 = 3

- 3 - y + 4y = 6

-3 + 3y = 6

3y = 6 + 3

y = 3

putting value of y in equation (1)

x = (3 + y)/2

x = (3 + 3)/2

x = 6/2

x = 3

x + y = 3 + 3

x + y = 6