marting1667 marting1667
  • 23-05-2017
  • Mathematics
contestada

A money box contains only 10-cent and 20-cent coins. There are 34 coins with a total value of $5.40. How many coins of each

Respuesta :

PHDFlopper
PHDFlopper PHDFlopper
  • 23-05-2017
10x+20y=540
x+y=34
y=34-x

Plug in (34-x) for y:
10x+20(34-x)=540
10x+680-20x=540
-10x=-140
10x=140
x=14

There were 14 ten cent coins and 20 20 cent coins
Answer Link

Otras preguntas

Aude slipped on ice going 7.6 m/s .What was her velocity before she hit the wal?
Pls who now a capital of Uzbekistan?
After William Jennings Bryan lost the presidential election in 1896, the People's party declined as a national political force. Which best describes the theme t
Martin Luther King, Jr. was a civil rights leader. Identify a way Martin Luther King, Jr. worked to achieve civil rights.
Jaxson and Avery are unknown artists. A well-known corporation says they will purchase their artistic services for five months.They won’t pay them,but jaxson an
TIME REMAINING 59:41 Read the sample student claim and the reasons listed for making this claim. Claim: Although many people argue that medical testing on anima
Variables y and x have a proportional relationship, and y = 21 when x = 14. What is the value of x when y = 12? Enter your answer in the box. x = please help
Raphael is ordering a scoop of ice cream. For the flavor, he is given the option of chocolate, strawberry, vanilla, cookies ‘n cream, or peanut butter. For the
Which important biochemical process receives a supply of nad ions from the fermentation process during anaerobic respiration?
The graph of a line goes up and to the right when: