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Use substitution to solve the system of equations. y = −2x x − 3y = 21 (3, 4) (−6, 12) (3, −6) (−2, −6)

Use substitution to solve the system of equations. y = −2x x − 3y = 21 (3, 4) (−6, 12) (3, −6) (−2, −6)
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5 votes
Use substitution to solve the system of equations.

y = −2x
x − 3y = 21

(3, 4)

(−6, 12)

(3, −6)

(−2, −6)

asked
User Brandt Bucher
by
7.6k points

1 Answer

2 votes
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

answered
User PPL
by
7.2k points
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