How does knowing the slope and y-intercept of a line best help you to predict other values?

What is the approximate circumference of the circle shown below?

What is the point-slope form of theequation for the line with a slope of-2 that passes through (1, 4)? a y + 1 = -2(x + 4)b y-1=-2(x-4)c y + 4 = -2(x + 1)d y - 4 = -2(x - 1)

Select the quadratic that has root x = 8 and x = -5