1...x^2 +y^2=25...serkel, senter=(0,0), radius=5
2...x+y=-7=strate line, slope=-1, y-intersept=-7
me assume yu want weer line hit the serkel
strate line...y=-x-7
serkel...x^2 +(-x-7)^2=25
x^2+x^2 +14x+49=25
2x^2 +14x+24=0
or (x+3)(x+4)=0
or x=-3 or -4
strate line at x=-3, y=3-7=-4...(-3,-4)
st x=-4, y=4-7=-3...point=(-4,-3)