It's called theta and it's a Greek letter.
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Typically, with hand written documents, the number zero will be indicated as a circle with a slash through it.
Yes, because the line crosses the y-axis at the origin and the y-value at that point is 0. Therefore, the y-intercept is zero and this equation for this line would be y=x.
Since the line is horizontal, the slope is zero.
y = 7
Displacement of a straight line is zero...