For Exercises 18, draw and carefully label the figures. Use the appropriate marks to indicate right angles, parallel lines, congruent segments, and congruent angles. Use a protractor and a ruler when you need to. Supplementary angles C and D with m D = 40

Section 1.3 Consistent Systems with Infinitely Many Solutions Geometric Representations of 2X2 linear systems (2 lines): • One intersection point • No intersection (parallel lines) • Infinitely many points in common (coinciding lines) The same three possibilities occur with 3X3 systems, there's either one solution, no solution...