Which of the following relations is a function?
1 answer:
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D (8, 6)
E (4, 10)
Answer: B. (6, 8)
E (4, 10)
Answer: B. (6, 8)
The linear combination method is the same as the elimination method. Let's multiply the second equation by -2 so the x terms cancel each other out. When we do that we get a system of 
and 
. The x-terms cancel each other out giving us 
and y = -3. Now sub -3 into one of the equations to solve for x. x+2(-3)=-4, and x - 6 = -4. x = 2. So the solution for our system is (2, -3)