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astraxan [27]
1 year ago
12

Find a1 when d= - 1 and a7= -2

Mathematics
1 answer:
Pie1 year ago
5 0

Answer:

  • a₁ = 4

Step-by-step explanation:

<u>Given</u>

  • d = - 1
  • a₇ = - 2

<u>Find</u> a₁

Use the nth term equation of AP

  • aₙ = a₁ + (n - 1)d

Apply to the given case and solve for a₁

  • - 2 = a₁ + 6(- 1)
  • - 2 = a₁ - 6
  • a₁ = 6 - 2
  • a₁ = 4
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