2 (−6.95 + 3.03 )(14.88 + 10.46 ) r A? z6.95+3.03b= B? 14.88+10.46b=n 3 (9.28 − 11.18 )(15.449 + 20.58 ) r A? 9.28p11.18b= B? 15.339+20.48b=n 4 (2.69 − 9.85 )(−6.88 − 5.82 ) r A? 2.69p9.85b= B? z6.88p5.82b=n 9