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The demand curve shows how different prices of a commodity affect the quantiy demanded by consumers.Price is always show on the y-axis (vertical) and quantity on the x-axis (horizontal). These two variabl...

Let's solve for x first by substituting y in terms of x.

4x-y=30

y=4x-30

3x+2y=3x+2(4x-30)=3x+8x-60=11x-60

11x-60=17

11x=77

x=7

Now let's solve for y by su...

Salamanca está en la parte central de España, a 212 kilómetros al oeste de Madrid. Su Plaza Mayor es el punto de encuentro más popular.  La gente pasa mucho tiempo allí charlando, tomando el sol o disfrut...

A catalyst increases the rate of the reaction because: 

• They provide an alternative energy pathway that has a lower activation energy 

• This means that more particles hav...

1. Friction from passing over the land makes them lose their energy

2. Land at high altitudes and water have a cooling effect, causing a loss of energy