If 10y = 7x - 4 and 12x + 18y = 1; find the values of 4x + 6y and 8y - x.

Given, Equations : 10y = 7x - 4 and 12x + 18y = 1 ⇒ 10y = 7x - 4 ⇒ y = .........(1) Substituting value of y from equation (1) in 12x + 18y = 1, we get : Substituting value of x in equation (1), we get : Substituting value of x and y in 4x + 6y and 8y - x, we get : Hence, .