Ok, so the best way to start off solving this would be to find the y intercept. The y intercept is the point that y is on when x is at 0
So when x (the horizontal axis, left to right) is at 0 the y axis (vertical axis, top to bottom) is at 3 That gives this equation a y intercept of 3, and because it is positive it will be plus 3
next we'll solve for the slope, the slope can be found using them formula (y2-y1)/(x2-x1)
We can use any two points on the line. So we'll use the points; (0,3) and (2,4)
So we plug these points into the equation, and the equation looks like... (4-3)/(2-0)
So 4-3= 1 and 2-0=2 We set the slope up in rise (y) over run (x) So the slope is 1/2 1/2 is equivalent to half. So the slope of the line is .5x or 1/2x with a y intercept of 3
So the equation would look like y=.5x+3 or y=1/2x+3
The element 15 has two arrows pointing to both 7 and 9. This is a clear violation of the requirement to be a function. A function is well behaved, that is, each element in the domain must point to one element in the range. Therefore, this relation is not a function.