The equation -4x + y = 0 relates the number of pages in a photo album y to the number of pictures in the album x. How do you tell whether the relationship is a direct variation?
1 Answer
Feb 1, 2016
The y-intercept of the equation is
Explanation:
Recall the general equation for a line in slope-intercept form:
#y=mx+b#
where:
In this equation, if you isolate for
#-4x+y=0#
#-4x# #color(red)(+4x)+y=0# #color(red)(+4x)#
#rArry=4x# #color(blue)(+0)#
Recall that in direct variation, the graph goes through the origin,
If you were to graph the line, you would see the intersection at
graph{y=4x [-12.66, 12.65, -6.33, 6.33]}