aₙ = a₁+d(n-1)
a₆-a₄ = a₁+5d - a₁ - 3d = 2d = -5
d = -2,5
a₁₀ + a₂ = a₁+9d+a₁+d = 2a₁+10d = -46
2a₁ - 25 = -46
a1 = (25-46)/2 = -10,5
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Verified answer
aₙ = a₁+d(n-1)
a₆-a₄ = a₁+5d - a₁ - 3d = 2d = -5
d = -2,5
a₁₀ + a₂ = a₁+9d+a₁+d = 2a₁+10d = -46
2a₁ - 25 = -46
a1 = (25-46)/2 = -10,5