Đổi thứ tự biến lấy tích phân của tích phân sau : \int _0^4\:dx\int _{2x^2}^{12x}\:f\left(x, y\right)dy

6(2x + 5y)6 (2x) = 12x6 (5y) = 30y12x + 30y

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for