What is the solution of the system of equations?

y = 3x + 7
y = x – 9

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Step-by-step explanation:

We can substitute

y

=

x

−9

in the first equation to get the value of

x

We get

x

−

9

=

3

x

+

7

Transposing

3

x

to the left hand side and

−

9

to the right hand side, we get

x

−

3

x

=

7

+

9

−

2

x

=

16

Dividing both sides by

−

2

, we get

−

2

x

−

2

=

16

−

2

x

=

−

8

Substituting

x

=

−

8

in the second equation, we get

y

=

−

8

−

9

y

=

−

17

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