y= 1 2 x+ 5 2 ,y= 1 2 x− 5 2 MathType@MTEF@5@5@+=feaagCart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9maalaaabaGaaGymaaqaaiaaikdaaaGaamiEaiabgUcaRmaalaaabaGaaGynaaqaaiaaikdaaaGaaiilaiaadMhacqGH9aqpdaWcaaqaaiaaigdaaeaacaaIYaaaaiaadIhacqGHsisldaWcaaqaaiaaiwdaaeaacaaIYaaaaaaa@4499@
20