samantha18xoxo
samantha18xoxo samantha18xoxo
  • 23-06-2017
  • Mathematics
contestada

Four computer desks and three office chairs cost $1110. Two desks and five chairs cost $940.

Find the cost of a computer desk.

Respuesta :

Аноним Аноним
  • 23-06-2017
let
d = cost of a computer desk
c = cost of an office chair

4d + 3c = 1110
2d + 5c = 940

multiply (2nd) equation by 2

4d + 3c = 1110
4d + 10c = 1880
------------------------subtract
-7c = - 770
 c = 110

2d + 5c = 940
2d + 5(110) = 940
2d = 550 = 940
2d = 390
d = 195


answer
cost of a computer desk = $ 195

Answer Link

Otras preguntas

A poems theme is____?
In which lines in this poem does the speaker compare her love to the pursuit of a social cause? Sonnet 43
Choose the system to which this item belongs: hemoglobin excretory circulatory endocrine digestive respiratory
Ray UW is the angle bisector of VUT. If mVUW = (4x + 6)° and mWUT = (6x – 10)°, what is the measure of WUT? 32° 38° 48° 76°
Does polonium lend or borrow electrons?
Which word or words and punctuation best corrects any errors in the sentence? Our French teacher speaks several other languages for instance, Spanish, Italian,
Which of the following would most likely happen if the epithelial cells in the stomach failed to produce mucus? Food leaving the stomach would only be partially
Which group of metals plays a pivotal role in thesmartphone?
what do many Hindu gods and goddesses represent
Choose the system to which this item belongs: bladder excretory circulatory endocrine digestive respiratory