How do you write an equation of the line with slope -3 and y-intercept (0,-5)?
The slope-intercept equation for a straight line is
Your information states that the slope is -3, and the y-intercept is (0,-5). This is incorrect. The -5 is the slope-intercept, because that is the point where the line crosses the y-axis.
So now we can plug in the known values and write a slope-intercept equation for a straight line.