Answer :
The slope-intercept form of a line is:
y = mx + b
where m is the slope and b is the y-intercept
Substituting with m = -2 and the point (4, 2), we get:
2 = (-2)*4 + b
2 = -8 + b
2 + 8 = b
10 = b
Then, the equation of the line is:
y = -2x + 10