A line parallel to $y = 4x + 6$ passes through $(5, 10)$. What is the $y$-coordinate of the point where this line crosses the $y$-axis?
Any line that is parallel to y = 4x + 6 has a slope of 4.
You can use the point-slope form: y - y1 = m(x - x1)
where m = 4 x1 = 5 y1 = 10
---> y - 10 = 4(x - 5)
y - 10 = 4x - 20
y = 4x - 10
The y-intercept is -10.