The slope is 34.
The slope is how much the y-coordinate or y-value goes up for one unit to the right on the x-axis.
If you increase the x-coordinate by 1, or go to the right when you observe the line, the y-coordinate would go up by 34.
Slope can be 0, 0.3, 1, 5, 25, 99999, etc. It can be anything. For a completely vertical line, the slope is undefined.
You can also have negative slope, which means that the line goes down for every unit to the right, or if you add one to the x-coordinate value.
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