Slope-intercept form:
y = mx + b
"m" is the slope, "b" is the y-intercept (the y value when x = 0 or (0,y))
You know m = -3, so you can plug it into the equation
y = mx + b
y = -3x + b
To find "b", plug in the point (4,-2) into the equation
y = -3x + b
-2 = -3(4) + b
-2 = -12 + b Add 12 on both sides
10 = b
y = -3x + 10 Your answer is B