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2x+5y = 2 ... 2
...1 dikali 2
2x-6y = 24
Dikuragi ... 2
5y-(-6y)= 2-24
11y = -22
y = -2
Subs ke ... 1
x -3y = 12
x +6 = 12
x = 6
(a,b) --> (x,y) --> (6,-2)
2a-b = 2.6-(-2) = 14
Nomor2
P. Diagonal Ac = p. Diagonal BD
7x-3 = 4x+6
3x = 9 --> x=3
P. D. AC = 7x-3 = 21-3 = 18