Answer:
Four hours.
Step-by-step explanation:
She travels 2.5 miles an hour; so for her to travel ten miles, she must have hiked for four hours.
Answer:
I'm pretty sure the Y position of the eyes is 70.
If the Variable Y is equal to 70, and the Y variable is where the Y axis value goes. Then the Y position of the eyes is equal to the Y variable which is 70. I think that makes sense, but feel free to comment if it does not so that I can help you figure it out.
<em>The slope is 7/4</em>
<em>This means that for every 7 that Y changes, X changes by 4. Also, the problem would not go through the origin of a graph.</em>
<em>Hope this helps and have a nice day.</em>
<em>-R3TR0 Z3R0 (復古零) </em>
Answer:
D
Step-by-step explanation:
Parallel lines have the same gradient.
A line with a slope of zero is a horizontal line. Although two lines that have a slope of zero will result in two parallel lines, not all parallel lines are horizontal lines. Since the question is asking for which statement <u>must</u> be true, option A is incorrect.
If the slopes of two lines are negative reciprocals, they are perpendicular to each other. This is because the product of the gradients of 2 perpendicular lines is -1. Let the gradient of the first line be A and the other be B.
AB= -1
![A = - \frac{ 1}{B}](https://tex.z-dn.net/?f=A%20%3D%20%20%20-%20%5Cfrac%7B%201%7D%7BB%7D%20)
![B = - \frac{1}{A}](https://tex.z-dn.net/?f=B%20%3D%20%20-%20%20%5Cfrac%7B1%7D%7BA%7D%20)
Thus, option B is incorrect too.
Undefined slopes gives vertical lines. Like option A, if two lines have an undefined slope, they will be parallel to each other. However since parallel lines are nit necessarily vertical lines, option C is also incorrect.