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2. e
3. d
semoga membantu :)
sederhanakan dgn menyilangkan
3x+4y / 12 = 5 / 12 --> 3x + 4y = 5 x1 3x + 4y = 5
x/2 + y = 1 ---> x + 2y = 2 x2 2x + 4y = 4
------------------- eliminasi
x = 1
1 + 2y = 2
2y = 2 - 1
2y = 1
y = 1/2
x+y = 1+ 1/2
= 1 1/2
= 1,5
2. 12x + 17y = 53 x17 --> 12.17 x + 17.17 y = 53.17
17x + 12y = 63 x12 --->12.17x + 12.12 y = 63.12
--------------------------------------- eliminasi
0 + (17²-12²) y = 53.17 - 63.12
(17-12)(17+12) y = 53.17 - 63.12
5 . 29 y = 53.17 - 63.12
y = 901 - 756 / 145
y = 145 / 145
y = 1
17x + 12(1) = 63
17 x = 63 - 12
17x = 51
x = 3