Solve the system by substitution.
y= -x
10x+2y=40

Afurniture store has 1,500 chairs in storage. a manager uses three delivery receipts to simulate samples to check 100 chairs and note the number of brown chairs. suppose the actual number of brown chairs is 1,080. about how many brown chairs are

Math it's appreciated. (picture provided)

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left