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One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

What is the explicit formula for this sequence? -7, -4, -1, 2, a.) an = 8 + (b - 1)3 b.) an = -7 + (n - 1)3 c.) an = 3 + (n -1) (-7) d.) an = -7 + (n - )

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?