Question

elimination method x-2y=-1 ,3x-6y=-3​

Answer 1

Answer:

To get x:

(1) x - 2y = 3

(2) x + 6y = 19

Multiply the first equation by 3. The reason for this is then the value of y can be eliminated.

(1) 3x - 6y = 9

(2) x + 6y = 19

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4x + 0 = 28 (After adding the two equations together)

x = 7

To get y:

(1) x - 2y = 3

(2) x + 6y = 19

Multiply the first equation by -1. The reason for this is then the value of x can be eliminated.

(1) -x + 2y = -3

(2) x + 6y = 19

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0 + 8y = 16 (After adding the two equations together)

y = 2

The solution is x = 7 and y = 2

Answer 2

Answer:

Multiply the 1st equation by 3

(x-2y)×3 = -1×3 , 3x+6y=-3

3x-6y=-3, 3x+6y=-3

Now, add both the equations

3x-6y=-3

(+) 3x+6y=-3

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6x+0= -6

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6x=-6

x= -6/6

x= -1

Put the value of x in any of the two equations

x-2y= -1

-1 -2y= -1

-1 +1= 2y

0 = 2y

0 = y