The "slope-intercept" form for the equation of a line is
y = mx + b
where m is the slope and b is the y-intercept.
Suppose you are asked to find the equation of a line with slope 5 and y-intercept 3.
Simply substitute the slope and y-intercept for "m" and "b" in the formula:
y = mx + b
y = 5x + 3
That's all there is to it.
If, as in your problem, you are given the coordinates of the y-intercept, such as (0, 7), you need to realized that (0, 7) is a point on the y-axis and that is where the graph of the line crosses the y-axis.
Here's a link to an on-line lesson which may help you further:
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