Can someone please show me how to solve this? Thanks!

Question

Suppose y is directly proportional to x, and y=10 when x=2.

Find the constant of proportionality to x, and y = 10 when x=2.

Find the constant of proportionality and formula for y.

Use your formula to find x and y =20.

Answer 1

y=kx

10=2k

k=5= constant of proportionality

y=5x

20=5x

x=20/5= 4 when y=20