- Bridges like this on highways have expansion joints. They expand when it gets hotter.
- A certain bridge has a gap of 1.3 cm when the temperature is 22˚C and it has a gap of 0.9 cm when the temperature is 30˚C.
- At what temperature would the gap close completely?
- A certain bridge has a gap of 1.3 cm when the temperature is 22˚C and it has a gap of 0.9 cm when the temperature is 30˚C.
- Can I try?
- A certain bridge has a gap of 1.3 cm when the temperature is 22˚C and it has a gap of 0.9 cm when the temperature is 30˚C.
- Sure.
- y=-.4/8x+2.4 y=-.4/8(48)+2.4 y=-2.4+2.4 y=0 The gap will close at 48˚C.
- y=-.4/8x+2.4 At 35˚C the gap is at 0.65 At 10˚C the gap is at 2.9 y=-.4/8(48)+2.4 y=-2.4+2.4 y=0 The gap will close at 48˚C.
- Good job.
- The width intercept (2.4) shows that at 0˚C, the width will be 2.4 cm. The slope (-.4/8) shows that every time the temperature goes down 8 degrees, the gap is at .4