Question

the 9th term of an ap is equal to seven times the second term and 12th term exceeds 5 times the third term by 2 find the first term and the common difference

Answer 1

a9=7a2
a12=5a3+2
it means
a+8d=7a+7d,d=6a
a+11d=5a+10d+2
d=4a+2
2a=2
a=1
d=6
common difference =6
first term=1