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Dmitriy789 [7]
3 years ago
11

Describe the graph of the equation y = 4. Is the equation a function? vertical line; yes horizontal line; no vertical line; no h

orizontal line; yes
Mathematics
1 answer:
Alik [6]3 years ago
8 0
Yes it is a function. It is a horizontal line. 

Every point on this line is of the form (x,4) where x can be any number you want. The y coordinate is fixed at 4 and cannot change. Two points on this line are (0,4) and (1,4). The horizontal line goes through 4 on the vertical y axis. 

Why is it a function? Because it is impossible to draw a vertical line through more than one point on the graph of y = 4. The graph passes the vertical line test. Put another way, for any x input, there is exactly one y output. 

Side Note: y = 4 is the same as y = 0x+4. Note how its in the form y = mx+b
m = 0 is the slope
b = 4 is the y intercept
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