3x-5y+15=0
x=0, -5y=-15, y=3
(0;3)
y=0, 3x=-15, x=-5
(-5;0)
2)x^2+(2x)^2=4
x^2+4x^2=4
5x^2=4
x^2=4/5=0.8
y^2=4-4/5=3.2
x=+-
y=+-
3x-5y+15=0
x=0, -5y=-15, y=3
(0;3)
y=0, 3x=-15, x=-5
(-5;0)
2)x^2+(2x)^2=4
x^2+4x^2=4
5x^2=4
x^2=4/5=0.8
y^2=4-4/5=3.2
x=+-
y=+-