The answer is:
EXPLANATION
I dunno, this is just a technique. I believe you know that the vertex form of a quadratic equation is
Referring to the given vertex, you have (0,6). So, h should be 0 and k should be 6.
You can see that h is absent in the last two equations given that it is only x^2 and not x minus h.
Going to k, we can find that only the third equation has fulfilled a positive k (the fourth has -6).
In problems like this, I think you can already manage that easy to choose which among the quadratic equations show a particular vertex.
Answer:
The eldest of them is Brian and he is 24 + 2 = 26 years old.
Step-by-step explanation:
Let
Malachy age = a
Brian age = a + 2
Caroline age = a - 8
Total of their age = a + (a + 2) + (a - 8)
66 = a + (a + 2) + (a - 8)
collect like terms
66 = a + a + 2 + a - 8
66 = a + a + a - 6
3a = 66 + 6
3a = 72
divide both sides by 3
a = 72/3
a = 24
Malachy age is 24 . Caroline is 24 - 8 = 16 years old.
The eldest of them is Brian and he is 24 + 2 = 26 years old.
If I am right
Answer: 7
Good luck!
The slope is the m in y=mx+b equation; the coefficient attaches to the x; thusly making it 2.