Answered

If y varies directly as x and y = 4, when x = 12, find y when x = 3

Sagot :

y=kx

y1=y2
x1=x2

4=y2
12=3

12=12y2
÷12

1=y2

so the y=1
Direct Variation Equation: y = kx

When y = 4, x = 12
y = kx
4 = k (12)
4/12 = k
k = 1/3

When x = 3, find y:
y = kx
y = (1/3) (3)
y = 1