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Using the provided graph and equation, answer the following questions about a cyclist's journey. What time did the cyclist leave home? When did they return? What was their distance from home at 10 a.m

Mathematics

ScanSolve AI Answer

Answer

b
3
-2

Step-by-step solution

4 steps

Here are the solutions to the questions based on the provided graph and equation.

Part a(i)

Step 1: Identify the starting point of the journey (distance from home is 0 km).

The graph starts at (8 a.m.,0 km)(8 \text{ a.m.}, 0 \text{ km}).
The cyclist left home at 8 a.m.

Part a(ii)

Step 1: Identify the point where the cyclist returns home (distance from home is 0 km).

The graph ends at (5 p.m.,0 km)(5 \text{ p.m.}, 0 \text{ km}).
The cyclist returned home at 5 p.m.

Part a(iii)

Step 1: Locate 10 a.m. on the time axis and find the corresponding distance.

At 10 a.m., the distance from home was 20 km.

Part a(iv)

Step 1: Locate 11 a.m. on the time axis and find the corresponding distance.

At 11 a.m., the distance from home was 20 km.

Part a(v)

Step 1: Locate 2 p.m. on the time axis and find the corresponding distance.

At 2 p.m., the distance from home was 60 km.

Part a(vi)

Step 1: Locate 3 p.m. on the time axis and find the corresponding distance.

At 3 p.m., the distance from home was 60 km.

Part a(vii)

Step 1: Identify horizontal segments on the graph, which indicate no change in distance over time.

The cyclist took a rest from 10 a.m. to 11 a.m. and from 2 p.m. to 3 p.m.

Part a(viii)

Step 1: Locate noon (12 p.m.) on the time axis and find the corresponding distance.

At noon, the distance from home was 40 km.

Part a(ix)

Step 1: Locate 5 p.m. on the time axis and find the corresponding distance.

At 5 p.m., the distance from home was 0 km.

Part a(x)· 1 step

Step 1: Calculate the speed (gradient) for each moving segment.

Speed is the magnitude of the gradient of the distance-time graph.
Segment 1 (8 a.m. to 10 a.m.):

Speed1=20 km−0 km10 a.m.−8 a.m.=20 km2 h=10 km/h\text{Speed}_1 = \frac{20 \text{ km} - 0 \text{ km}}{10 \text{ a.m.} - 8 \text{ a.m.}} = \frac{20 \text{ km}}{2 \text{ h}} = 10 \text{ km/h}

Segment 2 (11 a.m. to 2 p.m.):

Speed2=60 km−20 km2 p.m.−11 a.m.=40 km3 h≈13.33 km/h\text{Speed}_2 = \frac{60 \text{ km} - 20 \text{ km}}{2 \text{ p.m.} - 11 \text{ a.m.}} = \frac{40 \text{ km}}{3 \text{ h}} \approx 13.33 \text{ km/h}

Segment 3 (3 p.m. to 5 p.m.):

Speed3=∣0 km−60 km5 p.m.−3 p.m.∣=∣−60 km2 h∣=30 km/h\text{Speed}_3 = \left| \frac{0 \text{ km} - 60 \text{ km}}{5 \text{ p.m.} - 3 \text{ p.m.}} \right| = \left| \frac{-60 \text{ km}}{2 \text{ h}} \right| = 30 \text{ km/h}
  1. Compare the speeds to find the fastest.

    The speeds are 10 km/h10 \text{ km/h}, 13.33 km/h13.33 \text{ km/h}, and 30 km/h30 \text{ km/h}. The fastest speed is 30 km/h30 \text{ km/h}.
    The cyclist was travelling most quickly from 3 p.m. to 5 p.m.

Part b3

  1. Rearrange the equation 6x−2y−4=06x - 2y - 4 = 0 into the slope-intercept form y=mx+cy = mx + c.

    6x−2y−4=06x - 2y - 4 = 0 −2y=−6x+4-2y = -6x + 4
  2. Divide by −2-2.

    y=−6x−2+4−2y = \frac{-6x}{-2} + \frac{4}{-2} y=3x−2y = 3x - 2
  3. Identify the gradient (mm) and y-intercept (cc).

    The gradient is m=3m = 3.
    The y-intercept is c=−2c = -2.

    The gradient is 3\boxed{3} and the y-intercept is −2\boxed{-2}.

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