Astore sold 21 sweatshirts. white ones cost $10.95 and yellow ones cost $12.50. in all, $260.95 worth of sweatshirts were sold. how many of each color were sold?

The store sold 1 white sweatshirt and 20 yellow sweatshirts

Step-by-step explanation:

Step 1: Express total cost of sweatshirts

Total cost of sweatshirts can be expressed as;

Total cost=(price per white sweatshirt×number of white sweatshirts sold)+(price per yellow sweatshirt×number of yellow sweatshirt sold )

where;

Total cost=$260.95

Price per white sweatshirt=$10.95

number of white sweatshirts sold=w

Price per yellow sweatshirt=$12.50

number of yellow sweatshirt sold=y

Replacing;

260.95=(10.95×w)+(12.5×y)

10.95 w+12.5 y=260.95...equation 1

Step 2: Express total number of sweat shirts sold

Total number of sweatshirts sold=number of white sweatshirts sold+number of yellow sweatshirt sold

where;

Total number of sweatshirts sold=21

number of white sweatshirts sold=w

number of yellow sweatshirt sold=y

replacing;

w+y=21...equation 2

Step 3: Solve simultaneously equation 1 and 2

1(10.95 w+12.5 y=260.95)>>>10.95 w+12.5 y=260.95

-

12.5(w+y=21)>>>12.5 w+12.5 y=262.5

(10.95 w-12.5 w)+(12.5 y-12.5 y)=260.95-262.50

-1.55 w=-1.55

w=1.55/1.55

w=1

Replace the value of w in equation 2

w+y=21

1+y=21

y=21-1=20

The store sold 1 white sweatshirt and 20 yellow sweatshirts

ratio is 2 : 9

the answer is three

13.5 : 3

b. y = 4x - 2

step-by-step explanation:

to find a parallel equation to an equation, make sure both equations have the same slope but different y-intercepts.

y = 4x + 1

4 = slope

1 = y-intercept

y = 4x - 2

4 = slope

-2 = y-intercept

they both have the same slope but different y-intercepts, so, b. is the correct answer.

and to check your work, you can graph both equations. : )