2006-12-18 15:22:57 · 9 answers · asked by shawnta b 1 in Science & Mathematics ➔ Mathematics
y varies directly as x means
y=c*x (c is const.)
c=y/x
putting values of x and y
c=5/3
to find y if x=18
y=c*x
y=(5/3)*18
y=5*6
y=30
therefore y=30 when x=18
2006-12-18 15:29:13 · answer #1 · answered by girish sahare 2 · 0⤊ 0⤋
If y varies directly as x, and y = 5 when x = 3, => y = 30 when x = 18. note when x = 3, the you have to multiply by 6 to get 18. Therefore if y = 5, multiply it by 6 as well, in keeping with the condition, and you get 30.
2006-12-18 15:28:30 · answer #2 · answered by flyfisher_20750 3 · 0⤊ 0⤋
I think y=30 if x=18. Reasoning 3*6=18 5*6=30.
2006-12-18 15:26:19 · answer #3 · answered by Speed racer 3 · 0⤊ 0⤋
30
2006-12-18 15:25:24 · answer #4 · answered by jenna 2 · 0⤊ 0⤋
y would = 30
2006-12-18 15:25:50 · answer #5 · answered by jay b 3 · 0⤊ 0⤋
Divide 18 by 3, and multiply that value by 5.
18/3=6 (x increased six times)
5*6=30 (y also increases six times)
2006-12-18 15:28:10 · answer #6 · answered by Joy M 7 · 0⤊ 0⤋
α - Proportional sign.
y α x
y = k x
5 = k(3)
5/3=k
y = k x
y = 5/3* (18)
y = 30
2006-12-18 21:40:01 · answer #7 · answered by Brenmore 5 · 0⤊ 0⤋
y = kx
5 = k(3)
5/3=k
y = 5/3* (18)
y = 30
2006-12-18 15:25:09 · answer #8 · answered by keely_66 3 · 1⤊ 0⤋
y1/x1 = y2/x2
5/3 = y/18
6*5 = y
30 = y
2006-12-18 15:25:34 · answer #9 · answered by sft2hrdtco 4 · 0⤊ 0⤋