Question 117995
YOU NEED TO LOOK AT THE PROBLEM A LITTLE CLOSER.  x AND y DOES NOT REPRESENT THE COST OF PENCILS AND PENS.  WE ARE TOLD THAT 10 CENTS AND 30 CENTS REPRESENTS THE COST OF PENCILS AND PENS. 0.10x REPRESENTS THE COST OF ALL PENCILS BOUGHT AND 0.30y REPRESENTS THE COST OF ALL PENS BOUGHT.

ALSO (c), THE SLOPE-INTERCEPT FORM IS NOT CORRECT AND THEREFORE (d) IS NOT CORRECT:

y=mx+b where m is slope and b is the y-intercept is the standard form

HOPE THIS HELPS---PTAYLOR