A particle has position vector (−2i+4j)+t(4i−6j)(-2\mathbf i+4\mathbf j)+t(4\mathbf i-6\mathbf j)(−2i+4j)+t(4i−6j) metres at time t t\,t seconds. Show that it passes through A(8,−11)A(8,-11)A(8,−11) and find its speed.