What is the slope of the line?

Agiven line has the equation 2x + 12y = −1. what is the equation, in slope-intercept form, of the line that is perpendicular to the given line and passes through the point (0, 9)? y = ( )x + 9

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)