Add the two angles and set them equal to 180, them solve for x
Answer:
The slope is
.
Step-by-step explanation:
The equation is conveniently in slope-intercept form.

m - slope
b - y-intercept
-2/3 is in m's spot, so it is the slope of the equation.

Hope this helps.
Yes it is also a 50% decrease.
Use the depreciation formula.

Where 'p' is the principal value, 'r' is the rate it depreciates, and 'n' is the time. Just plug in what we know:

Simplify by subtracting:

Simplify the exponent:

Multiply: