Question

I think of two numbers,when I double the first one and add on the second I get 17 when I treble the first one and subtract the second one I get 18 .find the number
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Answer 1

Answer:

2x+y = 17

3x-y=18

Step-by-step explanation:

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Answer 2

Answer:

Step-by-step explanation:

Let x and y be the two numbers,

2x + y = 17     2x  = 17 – y      x = 17 – y   (1)

                                                       2

3x – y = 18   (2)

Substitute (1) in (2).

3(17 – y) – y = 18

     2

     51 – 3y – 2y = 36

                    -5y = 36 – 51

                    -5y = -15

                       y = 3

                       x = 7