Describe the relationships among the measures of the angles of a triangle.

The sum of the measures of angles in triangles is 180°. The measure of exterior angles is equal to the sum of the measures of its two interior angles. The sum of the measures of two sides of a triangle is greater than the measure of the third side. 

Abit confused about what you mean, but i think you might be referring to slope intercept form: y = mx + bin that case b, or the y intercept is already given.(0,-1)find the slope by using the formulay2 - y1/x2 - x1the final slope will be 4/2, equivalent to 2.now your equation should look like thisy = 4/2x -1sorry if this didn’t you out!