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y = b
3x-4y = -26
3a-4b= -26
x+2y=8
a+2b =8
eliminasi:
3a-4b = -26 (kali 1)
a+ 2b= 8 (kali 3)
3a-4b = -26
3a+6b = 24
__________ -
-10b = -50
b= 5
a+2b=8
a+10=8
a= -2
*4a+3b= 4(-2)+3 (5)= -8+15= 7