A) Two parallel lines, intersecting a 3rd line (a traversal), indicates that two same-sided, internal angles MUST be SUPPLEMENTARY (sum, or add up to 180°).
b) Since <1 and <2 are supplementary, they add up to 180°. Therefore, <1 + <2 = 180: (20x+5) + (24x-1) = 180 44x + 4 = 180 44x + 4 -4 = 180-4 44x = 176 44x/44 = 176/44 x = 4
