Answer:
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If a = b then a + b cannot possibly equal b unless both a & b = 0, which defeats the purpose of the entire equation. If you plug in any possible value besides 0, the equation disproves itself.
I think what you do is pretend it is a circle and find the circumference of the circle then cut that amount in half. The straight side of the semicircle is the diameter of the whole circle, so you add that to the half of the circle. Hope this helps (and wasn't explained badly)!
y = mx + b
Where m = slope and b is the y intercept
Let's find the slope = change in y/change in x
m = (4-2)/(-6+2) = 2/-4 = -1/2
Now we have:
y = (-1/2)x + b
Now substitute point (-6,4)
4 = (-1/2)(-6) + b
4 = 3 + b
b = 1
So y = (-1/2)x + 1 is the equation.