The variable x represents the number of long-sleeve shirts Nancy bought and the variable y represents the number of short-sleeve shirts she bought.
Nancy bought 531 shirts for her business. She bought 2 times as many short-sleeve shirts as long-sleeve shirts.
How many of each type of shirt did she buy?
Which system of equations models this problem?
Responses
{x+y=531y=2x
{x+y=2y=531x
{x−y=531y=2x
{x+2y=531y=2x
2 answers
The correct answer is: x+2y=531, y=2x
actually the correct system would be
x+y = 531
y = 2x
solving:
using sub
x +2x = 531
3x = 531
x = 177, and y = 354
twice as many y's as x's ? YES
sum of x and y = 177+354 =531, all is good here
x+y = 531
y = 2x
solving:
using sub
x +2x = 531
3x = 531
x = 177, and y = 354
twice as many y's as x's ? YES
sum of x and y = 177+354 =531, all is good here