At an amusement park, Bill enjoys two rides on the water slide and three rides on the Ferris wheel, and it cost him $15.55. If the water slide costs $3.95, find the cost of the Ferris wheel.

$2.55

Step-by-step explanation:

Let

Cost of Water slide = x

Cost of Ferris wheel = y

Cost of Water slide = $3.95

Cost of Ferris wheel = ?

Total cost = $15.55

The equation

2x + 3y = 15.55

2(3.95) + 3y = 15.55

7.9 + 3y = 15.55

3y = 15.55 - 7.9

3y = 7.65

y = 7.65 / 3

= 2.55

y = $2.55

The cost of the Ferris wheel is $2.55

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step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18