On the graph of 2y=8×+7, the y-intercept is

3.5.

To find the y-intercept, we plug in x=0, since the y-intercept is where the line crosses the y-axis (where x=0). So:

2y = 8(0) + 7
2y = 7
y = 3.5

Therefore, the y-intercept is 3.5.