Use the given transformation to evaluate the integral.
∬r (x - 8y) da, where r is the triangular region with vertices (0, 0), (7, 1), and (1, 7). x = 7u + v, y = u + 7v

For the transformation

the Jacobian is

with determinant

The vertices of the triangle in the -plane are

Then the integral is

its the fourth option

a

step-by-step explanation:

rurbrbrjrnrbjr