What is the solution to the system of equations? use the substitution method.
y-3x=7
21+9x=3y
a. there is no solution
b. there are an infinite number solutions
c. the solution is {1,10}
d. the solution is {28,0}

total amount to be paid = $19.5

step-by-step explanation:

given ,

original price = $25.99

discount = 25%

discount amount = 25% of original price

discount amount = 25/100   * 25.99

discount amount = $6.49

hence , the total amount to be paid = original price - discount amount

                                                            = $25.99 - $6.49

                                                            =$19.5

total amount to be paid = $19.5