Y is directly proportional with x. Write an equation that shows the relationship if y=3 and x=12. A. y=4x
B. 3y=12x
C. x=14y
D. y=14x

y = x

Step-by-step explanation:

Given that y is directly proportional to x then the equation relating them is

y = kx ← k is the constant of proportion

To find k use the condition y = 3 when x = 12, then

3 = 12k ( divide both sides by 12 )

= = k , thus

y = x ← equation of proportion

10 cm

step-by-step explanation:

if the polygon is a rectangle, then the perimeter is x+x+y+y. using the values that you gave, the perimeter is 3+3+2+2=10cm.