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sdas [7]
3 years ago
14

I am a 2 digit number my digits have difference of 7

Mathematics
1 answer:
Norma-Jean [14]3 years ago
6 0
70
7-0=7

81 or 18
8-1=7

92 or 29
9-2=7
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Answer:

x = -5, and y = -6

Step-by-step explanation:

Suppose that we have two equations:

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and

C = D

combining the equations means that we will do:

First we multiply both whole equations by constants:

k*(A = B) ---> k*A = k*B

j*(C = D) ----> j*C = j*D

And then we "add" them:

k*A + j*C = k*B + j*D

Now we have the equations:

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4*(-x - y = 11)

Then we get:

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Now we have the two equations:

-4*x - 4*y = 44

4*x - 5*y = 10

(here we can think that we multiplied the second equation by 1, then we have k = 4, and j = 1)

If we add them, we get:

(-4*x - 4*y) + (4*x - 5*y) = 10 + 44

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y = 54/-9 = -6

Now that we know the value of y, we can simply replace it in one of the two equations to get the value of x.

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-x = 11 -6 = 5

-x = 5

x = -5

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x = -5, and y = -6

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