mayakenney9 mayakenney9

19-01-2020
Mathematics

contestada

16.
What is the solution of the system of equations?
y = 3x + 7
y = X-9
(-17, -8)
(-8, -17)
(-1,-10)
(4, 19)

Respuesta :

19-01-2020

y = 3x +7
y + 9 = x

y = 3(y+9) + 7

y = 3y + 27 + 7

0 = 2y + 34

-2y = 34

y = -17

Substitute into any original equation:

-17 + 9 = x

-8 = x

Therefore co-ordinates are:

(-8, -17)

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