The line that passes through (1,5) and (4,-4). (hint: find the slope first.)

The slope of a line is given by the equation 

y2 is -4. y1 is 5
x2 is 4. x1 is 1

-4 -5 / 4-1 = -9/3 = -3
The slope is -3. Now we need to find the y-intercept

y= mx +b
5= -3(1) +b
5= -3 +b
b= 8
Our equation for the line: y= -3x +8

B. 2 1/2 feet. multiply 2.5 inches by 12 to get thirty inches then divide by 12 to get 2.5 feet