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What is the solution to the system of equations below?

(9, –36)
(9, 0)
(–9, 18)
(–9, –42)

What is the solution to the system of equations below? (9, –36) (9, 0) (–9, 18) (–9, –42)-example-1

2 Answers

3 votes

Answer:

It is A

Explanation:

What is the solution to the system of equations below? (9, –36) (9, 0) (–9, 18) (–9, –42)-example-1
User Helmut Januschka
by
8.8k points
1 vote

Answer:

x = 9, y = -36 → (9, -36)

Explanation:


y=-3x-9\qquad(1)\\\\y=(1)/(3)x-39\qquad(2)\\\\\text{Substitute (1) to (2)}\\\\-3x-9=(1)/(3)x-39\qquad\text{multiply both sides by 3}\\\\-9x-27=x-117\qquad\text{add 27 to both sides}\\\\-9x=x-90\qquad\text{subtract}\ x\ \text{from both sides}\\\\-10x=-90\qquad\text{divide both sides by (-10)}\\\\x=9


\text{Put the value of x to (1):}\\\\y=-3(9)-9\\\\y=-27-9\\\\y=-36

User Edonbajrami
by
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