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3 years ago

2x-5y=22n y=3x-7 Use substitution to solve the system.

Mathematics

1 answer:

Elden [556K]3 years ago

7 0

Answer:

x = 1 , y = -4

Step-by-step explanation:

2x - 5y = 22 ------- ( 1 )

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

Substitute ( 2 ) in ( 1 ) :

2x - 5 (3x - 7) = 22

2x - 15x + 35 = 22

- 13x = 22 - 35

- 13x = - 13

x = 1

Substitute x in ( 1 ) :

2x - 5y = 22

2 ( 1 ) - 5y = 22

- 5y = 22 - 2

-5y = 20

y = - 4

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For this case, what we can do is factorize to write the polynomial in an easier way and thus be able to find the roots.
Factoring we have:
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x = 3i
x = -3i
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