document.write( "Question 500182: It cost a familly of seven a total of $119 for general admission tickets to the San Diego Zoo. If adult tickets cost $21 and children's tickets cost $14, how many adult tickets were purchased?
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Algebra.Com's Answer #338068 by Maths68(1474)\"\" \"About 
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Let
\n" ); document.write( "x=Adult Ticket
\n" ); document.write( "y=Children Ticket\r
\n" ); document.write( "\n" ); document.write( "Cost of Adult ticket = $21
\n" ); document.write( "Cost of Children ticket = $14\r
\n" ); document.write( "\n" ); document.write( "Cost of x tickets purchased=21*x
\n" ); document.write( "Cost of y tickets purchased=14*y\r
\n" ); document.write( "\n" ); document.write( "Adult tickets purchased + children’s tickets purchased = Total tickets purchased
\n" ); document.write( "x+y=7
\n" ); document.write( "x=7-y………………(1)
\n" ); document.write( "Cost of Adult tickets purchased + Cost of Children’s tickets purchased = Cost of total tickets purchased
\n" ); document.write( "21x+14y=119……..(2)
\n" ); document.write( "Put value of x from (1) to (2)
\n" ); document.write( "21(7-y)+14y=119
\n" ); document.write( "147-21y+14y=119
\n" ); document.write( "147-7y=119
\n" ); document.write( "-7y=119-147
\n" ); document.write( "-7y=-28
\n" ); document.write( "Divide by -7 both sides of above equation
\n" ); document.write( "-7y/-7=-28/-7
\n" ); document.write( "y=4
\n" ); document.write( "Put value of y in (1)
\n" ); document.write( "x=7-y………………(1)
\n" ); document.write( "x=7-4
\n" ); document.write( "x=3
\n" ); document.write( "4 Children tickets and 3 Adult tickets were purchased.
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