You need to evaluate the product of the vectors `u = u_x*i + u_y*j, v = v_x*i + v_y*j` , such that:
`u*v = u_x*v_x + u_y*v_y`
`u*v = (-4)*2 + 1*(-3)`
`u*v = -11`
Hence, evaluating the product of the vectors `u = u_x*i + u_y*j, v = v_x*i + v_y*j,u = <-4,1>, v = <2,-3>` , yields `u*v = -11.`
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