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Question

directrix · Answer

Solve this pair of equations for a and d  (a represents a sub 1)

74     =   a + d*4
1460 =   a + d*70

Post what you get, okay?

anonymous · Answer

I dont get it -_-

anonymous · Answer

ait hold on.let me show uu wat I got ;)

anonymous · Answer

Nope Idk .-.

directrix · Answer

What if the problem were to solve these two equations simultaneously? Could you do it?

x + 4y = 74
x + 70y = 1460
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anonymous · Answer

Does this have anything to do with my problem?

directrix · Answer

Yes. If you solve for x and y, we can do the other two questions easily.

x = a and y = d

I thought x and y variables might make the problem of finding a simultaneous solution easier for you.

We need the value of x and y to get the first term of the sequence. 

a is the first term and d is the common difference of the sequence.

anonymous · Answer

^Okaii ik that bacause the arithmetic and geometric formula.