Winter holiday homework 5#
Level
pending
If y varies directly with x, and it is given that y = 8 when x = 5, find the value of "k" and the value of x when y is 7.
-8/5, -35/8
8/5, -35/8
8/5, 35/8
5/8, 35/8
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
They varies directly means that y = kx, so the value of k is 8/5. When y = 7, x should be 7÷ 8/5, which is 35/8.
y = kx
8 = k × 5
k = 5 8
7 = 5 8 x
x = 7 × 8 5
x = 8 3 5