Solve the system of equations using substitution. 3y = - x + 2 y = - x + 9 (-1, 8) (10, - 1) (20, - 4) (3, 6)

Question

Mathematics

Nehemiah

19 February, 05:31

Solve the system of equations using substitution. 3y = - x + 2 y = - x + 9 (-1, 8) (10, - 1) (20, - 4) (3, 6)

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Answers (1)

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Dana · Answer 1

Step-by-step explanation:

3y = - x + 2 ... (1)

y = - x + 9 ... (2)

Substituting (2) in (1)

3 (-x + 9) = - x + 2

-3x + 27 = - x + 2

-3x + x = 2 - 27

-2x = - 25

x = - 25/-2

x = 12 1/2

Putting x in (2)

y = - x + 9

y = - 25/2 + 9

y = (-25 + 18) / 2

y = - 7/2

y = - 3 1/2