document.write( "Question 1047249: At a store three notebooks and two pencils cost $2.80 at the same prices two notebooks and five pencils cost $2.60 find the cost of one notebook and one pencil \n" ); document.write( "
Algebra.Com's Answer #662746 by ewatrrr(24785)![]() ![]() You can put this solution on YOUR website! Two EQs, two unknowns: n(notebooks) and p(pencils) \n" ); document.write( "3n + 2p = 2.80 \n" ); document.write( "2n + 5p = 2.60 Multiply by -2/5 to eliminate p\r \n" ); document.write( "\n" ); document.write( "(15/5)n + 2p = 2.80 \n" ); document.write( "-(4/5)n - 2p = -1.04 \n" ); document.write( "(11/5)n = 1.76 \n" ); document.write( "n = $0.80, cost of notebook 80cents \n" ); document.write( "p = $0.20 \n" ); document.write( "\n" ); document.write( "AND \n" ); document.write( "2.40 + 40 = 2.80 CHECKS! \n" ); document.write( "3n + 2p = 2.80 \n" ); document.write( " |