Answer:
y=20 when x=5
Step-by-step explanation:
you can find the value of y when x is 1
(it'll be 4)
then you can multiply 4 by 5 which is 20
Answer:
y = 50
Step-by-step explanation:
Given y is directly proportional to x² then the equation relating them is
y = kx² ← k is the constant of proportion
To find k use the condition y = 8 when x = 2 , then
8 = k × 2² = 4k ( divide both sides by 4 (
2 = k
y = 2x² ← equation of proportion
When x = 5 , then
y = 2 × 5² = 2 × 25 = 50
