13 ๆฌกใฎๅใใซ็ญใใชใใใ
โก(1) A (3,3),B(8, 5, 5, 8) ใ้ ็นใจใใโณABCใใใใ็ด็ทy=ax+2ใโณABCใจไบคใใใจใ,ฮฑใฎๅคใฎ
็ฏๅฒใๆฑใใใ
ๅ(2) 2็ด็ทx+2y+1=0ใจ2x-y-3=0 ใฎไบค็นใAใจใใใ็ด็ทlใๅฏพ็งฐ่ปธใจใใฆ็นAใจๅฏพ็งฐใช็นใB(-3, 5)ใฎ
ใจใใ็ด็ทlใฎๅผใๆฑใใใ
95