Write an equation in slope- intercept form for the line with slope 5/3 amd a y intercept of -2

How do i do this activity, is appreciated

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

Which best describes the construction of a triangle if given the segment lengths of 2 cm, 3 cm, and 5 cm? a) unique triangle b) cannot be determined c) triangle not possible d) more than one triangle