I need help on these two and I will be giving 20 points and a crown

Which statement is true 1.the pythagorean theorem can be used to find the missing side of any triangle 2.the pythagorean theorem can be used to find the missing side of any polygon 3. the pythagorean theorem can be used to find the missing side of any right triangle 4.the pythagorean theorem can be used to find the missing side of any isosceles triangle

What is the solution to the system of equations? (–2, –8) (–1, –5) (0, –2) (2, 4)

What is the slope of the line shown below?