Question 731512
10X+Y=155 MULTIPLY BY -2 & ADD.
12X+2Y=189
-20X-2Y=-310
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-8X=-121
X=-121/-8
X=$15.125 COST OF ONE BALL.
10*15.125+Y=155
151.25+Y=155
Y=155-151.25
Y=$3.75 COST OF ONE BAG.
PROOF:
12*15.125+2*3.75=189
181.50+7.50=189
189=189