This is true. In order to get an obtuse triangle, one angle must be greater than 90 degrees because the definition of an obtuse triangle is an angle measuring greater than the right angle. The other angles must be less than 90 degrees because the sum of the angles must be 180 degrees.
Basically, this equation is called the "slope intercept form" and to change into into that, you must simplify the equation.
What is the complete question and what are the choices??
