Hey there!!
Direct variation :
y = kx
( k is the constant )
And given : y = 5a when x = a
y = 5a can be written as y = 5x
Now we know 5 is the constant.
When x = 3a + 2 what is the value of y?
y = kx
y = 5 ( 3a + 2 )
y = 15a + 10
Hope my answer helps!!
