The graph below depicts the price of apples relative to the quantity.
How many kg of apples can you buy for $9?
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The graph below depicts the price of apples relative to the quantity.
How many kg of apples can you buy for $9?
Let's first observe the Y-axis which is representative of the price. Locate 9 dollars - and mark a point.
From this point, we'll draw a vertical line until we meet the straight line.
Now let's observe the X-axis which is representative of the quantity in kg.
We'll draw a line from the point where we reached the Y-axis to the straight line, towards the X-axis and determine the weight: 8 kg.
8
Look at the function shown in the figure.
When is the function positive?
Look for the labels! The y-axis (vertical) shows 'Precio' (Price) and the x-axis (horizontal) shows 'kg de manzanas' (kg of apples). Always read axis labels first.
Estimate as closely as possible using the grid lines. In this case, $9 intersects the line at exactly x = 8 kg, making it easy to read.
Yes! You can find the line's equation first. Looking at the graph, it appears to pass through (0,0) and has a slope, so you could write and solve for x when y = 9.
Drawing horizontal and vertical lines ensures accuracy! It's easy to misread coordinates when you just look at the graph. The lines help you read the exact values from both axes.
This is a linear relationship showing that as you buy more apples, the total price increases proportionally. The line shows the total cost for different quantities of apples.
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