Answer:
D. 7
Explanation:
To solve this problem, we need to know a certain equation: the equation of a line in the slope-intercept form:
y = mx + b; where m = slope and b = y-intercept.
First, substitute the known values into the equation. I will use the coordinate (3, 19) for x and y values.
y = 19
m = 4
x = 3
b = ?
19 = (4)(3) + b
Then, all we have to do is solve for b.
19 = (4)(3) + b
19 = 12 + b
19 - 12 = 12 + b - 12
7 = b
So, the y-intercept of the line is 7.
Hope this helps!