How are each of the ratios constructed on the circle? For example sinθ is the y coordinate opposite to θ

Solve the system of equations. y= 2x y= x^2 - 15

In two or more complete sentences describe how to determine the appropriate model for the set of data, (1,1), (3,2), (6,3), (11,4).

Select 2 statements that are true about the equation y+6=-10(x-3).1) the slope of the line is -102) the slope of the line is 33) one point on the line is (3,6)4) one point on the line is (3,-6)