droidd133 droidd133

25-03-2018
Mathematics

contestada

Use substitution to solve the system of equations.

y = −2x
x − 3y = 21

(3, 4)

(−6, 12)

(3, −6)

(−2, −6)

Respuesta :

jndawg04 jndawg04

25-03-2018

Substitute y into the second equation. x-3(-2x)=21
x+6x=21
7x = 21
x = 3
Find y by plugging in. y= -2(3)=-6

(3, -6) = C

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