October 2018 1 25 Report
Diketahui titik P(1, -4), Q(-4, 2), dan R(2, a). Jika garis yang melalui titik PQ tegak lurus dengan garis yang melalui titik QR, maka nilai a adalah.....
A. -7
B. -2
C. 2
D. 7
Pakai cara ya...
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