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3x + 5(4) = 14
3x + 20 = 14
3x = 14-20
x = -6/3
x = -2
3.
3x + 2y = 12
4x + 3y = 17
--------------- +
7x + 5y = 29
y = 4 dan 3x+5y=14
subs kedalam
3x + 5(4) = 14
3x + 20 = 14
3x = -6
x = -2
nomor 3
3x + 2y = 12 dan 4x + 3y = 17 maka 7x+5y???
eliminasi
3x + 2y = 12 | * 3
4x + 3y = 17 | * 2
9x + 6y = 36
8x + 6y = 34 -
x = 2
substitusikan x kedalam
3x + 2y = 12
3(2) + 2y = 12
6 + 2y = 12
2y = 6
y = 3
subs x dan y kedalam
7x + 5y
7(2) + 5 (3)
14 + 15
29