The graph below depicts the price of apples relative to the quantity.
What is the price of 7 kg of apples?
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The graph below depicts the price of apples relative to the quantity.
What is the price of 7 kg of apples?
Let's first observe the X-axis which is representative of the weight. Locate 7 kg - and mark a point.
From this point, we'll draw a vertical line until we meet the straight line.
Let's now observe the Y-axis which is representative of the price.
We will draw a line from the point where we reached the X-axis to the straight line, towards the Y-axis and determine the price: 8 dollars.
8
Look at the function shown in the figure.
When is the function positive?
Look at the axis labels! The horizontal (x-axis) shows 'kilograms of apples', and the vertical (y-axis) shows 'price'. Always check labels first.
That's okay! Estimate the value by looking at where your vertical line intersects the graph line, then read across to the y-axis. The line should help you find the exact value.
Drawing lines helps ensure accuracy! It's easy to misread coordinates when you just estimate visually. The vertical and horizontal guide lines guarantee you're reading the correct values.
Look for a pattern in the linear relationship. If the line goes up steadily, larger x-values should give larger y-values. Also, check if nearby points make sense with your answer.
A straight line means there's a constant rate - the price per kilogram stays the same. This is called a linear relationship between quantity and total price.
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