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Verified answer
2a + 3b = 4a - 3b = -7
------------------ +
3a = -3
a = -1
a - 3b = -7
-1 - 3b = -7
-3b = -6
b = 2
Maka,
4a - 3b
= 4 (-1) - 3 (2)
= -4 - 6
= -10
x-3y= -7
------------- (lakukan eliminasi)
3x=-3
x= -1=a (masukkan ke salah satu persamaan)
x-3y= -7
(-1)-3y= -7
-3y= -6
y=2=b
4a-3b (masukkan angka yg telah didapat)
4(-1)-3(2)
-4-6
-10
maaf jika ada yg salah