Final answer:
To write the equation of a line in slope-intercept form, we can use the given slope and a point on the line. Substituting the values into the equation, we find that the equation of the line is y = -3x + 25.
Step-by-step explanation:
To write the equation of a line in slope-intercept form, which is in the form y = mx + b, where m is the slope and b is the y-intercept, we can use the given slope and a point on the line.
Given: Slope = -3, Point (7,4)
We can substitute these values into the equation to find the y-intercept:
y = mx + b
4 = -3(7) + b
4 = -21 + b
b = 25
So the equation of the line in slope-intercept form is y = -3x + 25. Therefore, the correct answer is C) y = -3x + 25.