Find the value of x

Please

Find the equation of the line that goes through the points (4, –1) and (2, –5). use slope formula,equation,to find the slope of a line that passes through the points. m = use slope-intercept form, y = mx + b, to find the y-intercept (b) of the line. b = write the equation in slope-intercept form, y = mx + b.

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.

Use the squared identities to simplify sin^2x cos^2x