Answer:

step by step:
3x+5=-2
move constant to the right-hand side and change it's sign
3x=-2-5
Calculate the difference
3x=-7
Divided both sides of the equation by 3
Answer:
y = 1/2x
Step-by-step explanation:
y-intercept is (0, 0)
pick any point, let's say (-4, -1). Let's apply rise over run, rise up 2 points then run 4 points over to arrive at (4, 1). So, your slope is 2/4 which simplify to 1/2.
Equation of line:
y = mx + b
m is your slope
b is y-intercept
y = 1/2x + 0 same as y = 1/2x
When two variables varies inversely with each other, their product is always constant.
Since y = 4 when x = 4, their constant product is 16.
So when x = 2, y = 8.
If I assume you meant

Then the answer is at 4 minutes. This is just the vertex form of the parabola which is
where (h,k) is the vertex. h = 4 so the vertex is at 4 in the x-axis, or in the context of the problem it means at 4 minutes.