Please help me asap i will mark branlist please explain

30 in the diagram line e and made parallel to each other and line p and q are transversal. use properties of special angles formed by parallel lines and their transversals to find the missing angle measures. m< 3=65 m< 15=120 m< 7= m< 4= m< 6= m< 1= m< 16= m< 18= m< 21= m< 10= m< 11= m< 12=

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?