Final answer:
The equation of the line with slope -2 that passes through the point (4,2) is y = -2x + 10, which is option a).
Step-by-step explanation:
The equation of a line in slope-intercept form is given by y = mx + b, where m is the slope and b is the y-intercept. Given the slope m = -2 and a point (4,2), we can substitute the point into the equation and solve for b. We get:
y = mx + b
2 = (-2)*4 + b
2 = -8 + b
b = 10
Thus, the equation of the line is y = -2x + 10, which corresponds to option a).