document.write( "Question 1181280: The first four terms of an arithmetic sequence are 2, a-b, 2a+b+7, a-3b . Find a and b.
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Algebra.Com's Answer #811174 by MathTherapy(10809) $\"\"$ $\"About$

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\n" ); document.write( "The first four terms of an arithmetic sequence are 2, a-b, 2a+b+7, a-3b . Find a and b. \r
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document.write( "               ----- eq (i)
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document.write( "            2a + 3(- 3) = - 5 --- Substituting - 3 for b in eq (i)
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document.write( "                 2a - 9 = - 5
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document.write( "                     2a = 4
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