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m = y2 - y1/ x2 - x1
m = -1 -5 / -2 -1
m = -6 /-3
m = 2
kan ktmu M nya. terus kita skrg cari a pake rumus. yg sama cuma titiknya ganti pake yg P sama R
m = y2 - y1 /x2 - x1
2 = a + 1/3+2
2= a+1/5
a+1=5.2
a+1= 10
a= 9