Answer:
a5 = a1 + (5-1)*d
21 = a1 + 4d
a1 = 21-4d
a2 = a1+(2-1)*d
-2 = a1 + d
substitute
-2 = (21-4d)+d
-2 = 21 - 3d
3d = 21+2
3d = 23
d=23/3
a1 = 21-4(23/3)
a1 = -29/3
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Answer:
a5 = a1 + (5-1)*d
21 = a1 + 4d
a1 = 21-4d
a2 = a1+(2-1)*d
-2 = a1 + d
substitute
-2 = (21-4d)+d
-2 = 21 - 3d
3d = 21+2
3d = 23
d=23/3
a1 = 21-4d
a1 = 21-4(23/3)
a1 = -29/3