2007-10-20 20:03:03 · 6 answers · asked by smiley 1 in Science & Mathematics ➔ Mathematics
400 = 1000 k
k = 400 / 1000
k = 2 / 5
2007-10-21 08:47:24 · answer #1 · answered by Como 7 · 0⤊ 0⤋
y varies directly with x.
Therefore, y = k * x
Hence 400 = k * 1000
therefore, k = 400/1000
k = 2/5 or 0.4
2007-10-21 03:07:33 · answer #2 · answered by dromyl 3 · 0⤊ 0⤋
the formula for "y varies directly with x" is
y=kx
plug in your givens
400=1000k
k=400/1000 or .4
2007-10-21 03:07:38 · answer #3 · answered by KJH 4 · 0⤊ 0⤋
y=kx
manipulate to get the value of k therefore
k=y/x
if y=400 and x=1000
that means
k=400/1000 or
k=4/10
k=0.4
k is equal to 0.4
2007-10-21 03:11:56 · answer #4 · answered by Akoh 2 · 0⤊ 0⤋
2.5. Since "x" is 1000 and "y" is 400, simple observation demonstrates that 'x" is 2.5 times larger than "y". Your "K" then is 2.5.
2007-10-21 03:07:13 · answer #5 · answered by Anonymous · 0⤊ 2⤋
the variation of k is 400000
at least thats wat i think !!!!!!!!!!!!!
2007-10-21 03:06:32 · answer #6 · answered by Flopi 1 · 0⤊ 3⤋