Question 937865

Hello.
Can someone please help me with this series problem.

I need to find {{{a[1] }}} and  {{{d }}}
Given:
{{{a[7]=49}}} and {{{a[3] + a[9] = 82 }}}

Thank you.
<pre><font face = "Tohoma" size = 4 color = "indigo"><b>1st term, or {{{highlight_green(a[1] = 1)}}}
Common difference, or {{{highlight_green(d = 8)}}}      
You can do the check!! 
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