To do this plug in 0 for the x and y when you are trying to find one value like this:
First I would plug in 0 for y:
0 = -7x +3
Now do anything to isolate x:
-3 = -7x
3/7 = x
Now plug in 0 for x to find the y
y = -7(0) + 3
y = 3
Answer: 10.3 s
Step-by-step explanation:
Given
The height of the arrow is given by 
At
and 
When arrow hits ground, h becomes 0 i.e.

Neglecting the negative value of t
So, the arrow hits the ground after 10.30 s
Answer:(x)=10^x
Step-by-step explanation:
Log(x)=x
(x)=10^x