How to know if a graph represents a function or a non-function

try using the vertical line test

Draw a vertical line cutting through the graph of the relation, and then observe the points of intersection. if it crosses over it twice it is not a function.

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If the graph intersects the vertical line or the y-axis at two point it's not a function. While if it intersects at the y-axis at one point it is a function.

Step-by-step explanation:

Hope this helps.

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47