Question

Fill in the blanks. If 7x + 3y = 11 and 3x + 7y = -1, then x- y = _________.

Answer 1

Step-by-step explanation:

13..............,..,.

Answer 2

Answer:

7x+3y=11------------(1)

3x+7y=-1------------(2)

add eq(1) and eq(2

7x+3y=11------------(1)

3x+7y=-1------------(2)

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10x+10y=10

dividing both the side by 10 we get,

x+y=1-------------(3)

subtract eq (1) and (2)

7x+3y=11------------(1)

3x+7y=-1------------(2)

- - +

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4x-4y=12

divide both the side by 4 we get,

x-y=3--------------(4)

add eq (3) and (4)

x+y=1

x-y=3

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2x=4

x=4/2

x=2

putting x=2 in eq(3)

x+y=1

2+y=1

y=1-2

y=-1

x-y=2-(-1)

x-y=3