Answer:
x=5/4
r =20
Step-by-step explanation:
On the left we have 9x -7
On the right side we have -3x + 8
9x-7 = -3x+8
Add 3x to each side
9x+3x-7 = -3x+3x+8
12x -7 = 8
Add 7 to each side
12x -7+7 = 8+7
12x = 15
Divide each side by 12
12x/12 =15/12
x = 5/4
Carnival T
7+.5r
Carnival Q
12+.25r
Set them equal for the cost to be the same
7+.5r=12+.25r
Subtract .25r from each side
7+.5r-.25r=12+.25r-.25r
7+.25r = 12
Subtract 7 from each side
7-7+.25r = 12-7
.25r = 5
Divide each side by .25
.25r/.25 = 5/.25
r=20
