the 11th term of an AP is 4 times its second term .the sum of the first 7 terms of the same progression is 175;a,find the first term and the common difference of the progression

Answer 1

Using the usual formulas, you have
a+10d = 4(a+d)
7/2 (2a+6d) = 175
Now just solve for a and d

Answer 2

I need more explanation