the answer part n 13) is the option B there is exactly one solution (0,-2)
Part 14)
let x----> the number of years y-----> height of the tree in ft
case a) y=8+x-----> equation 1 case b) y=10+(1/2)x----> equation 2 equate equation 1 and equation 2 8+x=10+(1/2)x----> multiply by 2 both sides----> 16+2x=20+x 2x-x=20-16 x=4 years for x=4 years case a) y=8+x---> 8+4----> y=12 ft case b) y=10+(1/2)*4----> 10+2---> y=12 ft
the answer part 14) is 4 years
Part 15) let x----> number of adult tickets y----> number of child tickets
we know that x+y=14-----> x=14-y-----> equation 1 9x+5y=110-----> equation 2
substitute equation 1 in equation 2 9*[14-y]+5y=110----> 126-9y+5y=110 9y-5y=126-110 4y=16 y=4 x+y=14----> x=14-y-----> x=14-4----> x=10 so number of adult tickets is 10 number of child tickets is 4
