-5x + 3y = -19
4x - y = b
penyelesaian (a+1, a-4) ⇒ (x, y)
-5 (a+1) + 3 (a-4) = -19
-5a - 5 + 3a - 12 = -19
-2a - 17 = -19
-2a = -19 + 17
a = 1
(1+1, 1-4) ⇒ (2, -3)
4 (2) - (-3) = b
8 + 3 = b
b = 11
maka,
a + b = 1 + 11
a + b = 12
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-5x + 3y = -19
4x - y = b
penyelesaian (a+1, a-4) ⇒ (x, y)
-5 (a+1) + 3 (a-4) = -19
-5a - 5 + 3a - 12 = -19
-2a - 17 = -19
-2a = -19 + 17
a = 1
(1+1, 1-4) ⇒ (2, -3)
4x - y = b
4 (2) - (-3) = b
8 + 3 = b
b = 11
maka,
a + b = 1 + 11
a + b = 12