Why does all points $(x,y)$ satisfying $ax+by=c$ stay on a straight line?
124662
Why do we believe the equation $ax+by+c=0$ represents a line?
13993
Can we prove $ℝ^n ∖ \{\text{straight line}\}$ and $ℝ^n ∖ \text{\{an axis\}}$ homeomorphic by proving their complements homeomorphic?
65964
Prove that the line joining the midpoint of parallel sides of a trapezium passes through the point of intersection of diagonals
946
How to find solutions of linear Diophantine ax + by = c?
65522
The wedge sum of two circles has fixed point property?
118663
Looking for a Simple Argument for "Integral Curve Starting at A Singular Point is Constant"
72130
find the equation of the circle $x^2 +y^2 +ax +by = c$ passing through points $(6,8), (8,4), (3,9)$
129960
A curve pass via points at TiKz
33469
Diophantine equation $ax + by = c$ has an integer solution $x_0, y_0$ if and only if $\gcd(a,b)|c$
23851
Is there a set of lines in $\mathbb{R}^3$ such that their union is equal to the set of points with not all coordinates rational?
35066
Nature and number of solutions to $xy=x+y$
102487
Find a vector equation for the line through the point $(a,b,c)$ which is normal to the plane $\cdots$
83119
Compass-and-straightedge construction of the square root of a given line?
54430
For $a,b$ coprime, there exists positive integers $x,y$ such that $ax-by=1$
23355
A curve where all tangent lines are concurrent must be straight line
86753
All right angles are equal to each other
136782
Prove that $x * y = \frac{x+y}{1+xy}$ is a stable part of $G=(-1, 1)$