Question

1. Fie R,f(x)=-3x+2,determinati abcisa pct. de pe gf. f care are ordonata egala cu -1.
2.Fie R,f(x)=7x-8,determinati coordonata pct. de intersectie a gf. fct. f cu OX.

Answer 1

1. -3x+2=-1
    -3x=-1-2
    -3x=-3
     x=1

2.f(x) intersecteaza 0x=>y=0=> 7x-8=0=>7x=8=>x=$\frac{8}{7}$
  f(x) intersecteaza Oy=>x=0=> y=7*0-8=-8=> y=-8