A set of trading cards sells for $12 berire tax. After sales tax, it costs $12.60. What is the sales tax rate?

(Please explain how you got the answer)

sales tax rate is 5%

Step-by-step explanation:

Item x sales tax (in decimal form) = total sales tax.

Card before tax=$ 12

Card after tax= $12.6

Difference = $0.6

Take the difference and divide it by the total price: $0.6 ÷ $12.6

=0.0476

Convert the decimal into a percentage by moving the decimal point two places to the right: .0476 becomes 5%

Your original sales tax rate is 5%

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