I live to be st up id

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)