The graph does not show a linear relationship or a proportional relationship.
What is the greatest and lowest height of the tide?
This represents the highest and the lowest points on the graph.
From the graph, we have
Highest = 30
Lowest = 5
Hence, the greatest and the lowest heights of the tide are 30 and 5 respectively
At approximately what time in the morning is the tide at its highest height?
This is any time between 0 and 12, when the value of the tide is 30
From the graph, the value of the tide is 30 at approximately t = 5
Hence, the time in the morning is the tide at its highest height is 5 am
Does the graph represent a linear function? Explain.
Linear equations can take any of the following forms
Ax + By = C
y = mx + c
y - y1 = m(x - x1)
Any equation that takes a form different from the above forms is not a linear equation
Also, linear equations are represented by straight lines.
Hence, the equation does not show a linear relationship or a proportional relationship.
The domain and the range
In (a), we have:
Highest = 30
Lowest = 5
So, the range is:
Range = {y ∈ R | 5 <= y <= 30}
Also, the possible time is between 0 and 24.
So, the domain is:
Domain = {x ∈ Z | 1 <= x <= 24}
Read more about linear relationships at:
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