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a+bk=kx-d |-kx
a+bk-kx=-d |*(-1)
-a-bk+kx=d
a+bk=kx-d |+d
a+bk+d=kx |/k
(a+bk+d)/k=x
a+bk=kx-d |+d
a+bk+d=kx |/x
(a+bk+d)/x=k
b)ax²+by=y b; y; x
ax²+by=y |-ax2
by=y-ax2 |/y
b=(v-ax2)/y
ax²+by=y |-ax2
by=y-ax2 |/b
y=(v-ax2)/b
ax²+by=y |-by
ax2=y-by |/a
x2=(y-by)/a
x= (pod pierwisatkiem)(y-by)/a