4.3c Algebra 2.

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Presentation transcript:

4.3c Algebra 2

It’s important to draw a picture of what is happening: Word problems Motion Problems We use the equation (rate × time = distance). Example 1: A train leaves Sioux City traveling east at 30 km/h. Two hours later, another train leaves Sioux City traveling in the same direction on a parallel track at 45 km/h. How far from Sioux City will the faster train catch the slower one? It’s important to draw a picture of what is happening: Slow train: Fast train: They both went exactly the same distance. Rate Time Distance Slow 30 t d Fast 45 t – 2

Rate Time Distance Slow 30 t d Fast 45 t – 2 Two equations:

Go back to the original question. Example 1: A train leaves Sioux City traveling east at 30 km/h. Two hours later, another train leave Sioux City traveling in the same direction on a parallel track at 45 km/h. How far from Sioux City will the faster train catch the slower one?

Perimeter problems Perimeter = distance around a figure For a rectangle, Example: The perimeter of a rectangle is 384m. The length is 82m greater than the width. Find both dimensions. Heading: Length = Width =

Classwork: 14,24/172