I need help aome one pls help that is smart 8th grade math

Find the equation of the line that goes through the points (4, –1) and (2, –5). use slope formula,equation,to find the slope of a line that passes through the points. m = use slope-intercept form, y = mx + b, to find the y-intercept (b) of the line. b = write the equation in slope-intercept form, y = mx + b.

If 1 is divided by the sum of y& 4.the result is equal to 3 divided by 4, find the value of m

The step function g(x) is defined as shown.what is the range of g(x)? ***answer choices in picture.