point slope form: y-y1=m(x-x1)
coordinate (1,-7):
point y1--7
point x1=1
slope (m)=-23
input into equation:
y-(-7)=-23(x-1)
convert to slope intercept form:
-*-=+ so 7 becomes +7
y+7
distribute -23 in -23(x-1) using the rule: a(b+c)=ab+ac
-23x+23
refine
y+7=-23x+23
perform some inverse operations:
y+7=-23x+23
y+7=-23x+23-7
y=-23x+16
therefore, D. y+7=−23(x−1) equals y=-23x+16 in slope-intercept form
