Zad. 6
[tex]y=x+1\\a_1=1\\a_1*a_2=-1\\1*a_2=-1\\a_2=-1\\\\A=(0,5)\\5=-1*0+b\\5=0+b\\5=b\\\\k: y=-x+5[/tex]
Zad. 7
[tex]f(x)=-\sqrt2x+4\\0=-\sqrt2x+4 /+\sqrt2x\\\sqrt2x=4 /:\sqrt2\\x=\frac4{\sqrt2}=\frac{4\sqrt2}2=2\sqrt2[/tex]
Zad. 8
[tex]\left \{ {{-5=3a+b} \atop {7=-a+b /*3}} \right. \\+\left \{ {{-5=3a+b} \atop {21=-3a+3b}} \right. \\-5+21=b+3b\\16=4b /:4\\4=b\\-5=3a+4 /-4\\-9=3a /:3\\-3=a\\\\y=-3x+4[/tex]
Zad. 9
Niepelna tresc - brakuje osi symetrii paraboli.
