Seven times a number plus three times another number equals negative one. The sum of the two numbers is negative three. What are the numbers, provide the answer in the format of (x, y)

(2, -5)

Step-by-step explanation:

Let x = 1st no.

     y = 2nd

(1)      7x + 3y = -1          (2)    x + y = -3

                                                  y = -x - 3    Substitute -x - 3 for y in equation 1

         7x + 3(-x - 3) = -1

         7x - 3x - 9 = -1

                 4x - 9 = -1

                 4x = 8

                   x = 2                       y = - 2 - 3

                                                  y = -5

i can

step-by-step explanation:

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: