Question

if 3x+2y=13 and 3x-2y=5 then value of x+y is
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Answer 1

sol:-

Adding the equation

3x + 2y = 13

+ 3x - 2y = 5

6x = 18

x = 18/6 = 3

x= 3

substituting in 3x + 2y = 13

3× 3 + 2y = 13

9 + 2y = 13

2y = 13 - 9

2y = 4

y = 4/2 = 2

y = 2

now, x + y = 3 + 2 = 5

Answer 2

Answer:3x+2y=13------(1)

3x-2y=5--------(2)

(1)+(2)

3x+2y=13

3x-2y=5

6x=18

x=18/6

x=3

(1)-(2)

3x+2y=13

3x-2y=5

(-). (+). (-)

    4y=8

y=2

•°•x=3, y=2

x+y=3+2=5