Answer:
It is the first answer
Step-by-step explanation:
For it to be considered a function, each x-value can only corresponds (have) one y-value, however, y-values (even if they are the same y-value) can have multiple different x-values.
Answer:
3.5 hours
Step-by-step explanation:
Lets establish two equations, one for Tyrone's and other for Tina's position on the route, which is 119 miles long. Lets take city A as the mile 0 and city B as mile 119.
So, when Tyrone stars he is in mile 0, and each hour that passes he moves 19 miles. If x is the number of hours since he left, we can say his position in terms of x is:
f(x)=19x
Tina starts in mile 119, each hour that passes she moves 15 miles. For example, after 1 hour she will be at mile 119-15=104, in the next hour in mile 89 and so on, subtracting 15 miles each hour. So, here position can be:
g(x) = 119 - 15x
As we want them to meet, it means their position is the same, being both functions equal for some x:
f(x) = g(x)
19x = 119 - 15x
Summing 15x in both sides:
19x + 15x = 119
34x = 119
Dividing both sides by 34:
x = 119/34 = 3.5
So, they meet after 3.5 hours.
Let x represent the price they charge hardcover book and let y represent the price they charge for a paperback book.
4x + 10y = 62 . . . . . (1)
5x + 7y = 61 . . . . . . (2)
(1) x 5 ⇒ 20x + 50y = 310 . . . . (3)
(2) x 4 ⇒ 20x + 28y = 244 . . . . (4)
(3) - (4) ⇒ 22y = 66
y = 66 / 22 = 3
4x + 10(3) = 62
4x = 62 - 30 = 32
x = 32 / 4 = 8
Therefore, the price for a hardcover book is $8 and the price for a paperback book is $3.
Multiply 20 and 15, which is 300.
It doesn't look like that is an option so i don't know.
