How do you graph # y= -x - 5#?
1 Answer
Jan 25, 2016
see explanation
Explanation:
To graph a straight line only 2 points are required
although 3 points are better (in case of error with other 2 .)
To find the y-intercept let x = 0 : hence y = - 5 ie (0 , - 5 )
To find the x-intercept let y = 0 : hence -x - 5 = 0 so x = - 5
ie ( - 5 , 0 )
These 2 points will allow the line to be drawn but a 3rd
is preferable. Choose any value for x and evaluate y.
choose x = 2 : then y = - 2 - 5 = - 7 ie (2 , - 7 )
Plot these 3 points: (0 , - 5 ) , (- 5 , 0 ) and (2 , - 7 ) and
draw a straight line through them .Here is the graph of y = - x - 5
graph{-x-5 [-20, 20, -10, 10]}
