а) y=3/4xx^2+y^2=259/16x^2+x^2=2525x^2/16=25x^2/16=1x^2=16x=4;x=-4y=3;-3(4;3);(-4;-3)г) x-y=0 => y=xx^2+y^2=16x^2+x^2=162x^2=16x^2=8x=2√2;x=-2√2y=2√2;x=-2√2(2√2;2√2);(-2√2;-2√2)
а) y=3/4x
x^2+y^2=25
9/16x^2+x^2=25
25x^2/16=25
x^2/16=1
x^2=16
x=4;x=-4
y=3;-3
(4;3);(-4;-3)
г) x-y=0 => y=x
x^2+y^2=16
x^2+x^2=16
2x^2=16
x^2=8
x=2√2;x=-2√2
y=2√2;x=-2√2
(2√2;2√2);(-2√2;-2√2)