Answer: 15
<u>Step-by-step explanation:</u>
varies directly means: 
Plug in the given values of x and y to solve for k: 
→ 7 = k
Next, plug in the k-value of 7 and the given y value of 105 to solve for x:
15 = x
Follow the table in this order: everything on the left side of the table is the x axis value so if it is 2 find 2 on the horizontal line. Everything on the right side of the table is the y axis value so after you find where to go on the x go up from that spot to find where those two points meet. It may help if you are just starting to draw a line and find out where points meet but that will be time consuming and messy. Just remember what order you place coordinates and remember to read the labels on the graph. Hope that helped more :)
Answer:
-51
Step-by-step explanation:
5x + 3y -7z = 5 x 4 + 3 x -5 - 7 x 8
= 20 - 15 - 56
= -51
