z podanego równania wyznacz wskazaną niewiadomą a) 6x-12=3x+3a x?
b) -13z+2(5z-2a)=-20a+5z+40 z? c) b=-ay+dv y? d) ay-c=4ay-d y?
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a) 6x-12= 3x+3a /-3x, +12
3x = 12+3a
x= 4+a
b) -13z + 10z - 4a = -20a + 5z + 40
-3z - 4a = -20a + 5z + 40
16a - 40 = 8z
z= 2a -5
c) y= b/ dva
d) ay-c+d= 4ay
-c+d= 5ay
(-c+d) / a = 5y
y= (-c+d / a) / 5