Simple but hard 2 by 2 system in $x$ and $y$
30331
Steps to solve this system of equations: $\sqrt{x}+y=7$, $\sqrt{y}+x=11$
33543
is "y1 < x < y2" an inequality or inequalities?
121113
How to solve this nonlinear 2 by 2 equations?
39894
Graphing y=x^2 and y=x
103213
Minimum value in 2 variables
121533
$3\times3$ linear system organization
87331
Real polynomial in two variables
6793
A linearly independent set about approximate units
93123
Systems of linear equations to calculate $\alpha$ and $\beta$
70266
1-1 correspondence between [0,1] and [0,1)
41534
A system of logarithmic equations with parameters
136427
Given $∃y.∀x.p(x,y)$, use the Fitch system to prove $∀x.∃y.p(x,y)$
20568
Does the following have a solution for f(x,y)?
146933
Proving bipartition in a connected planar graph
108558
Find multiple solutions of a non-linear system with more variables that equations
85819
A non-polyhedral pair $(X,A)$ with both $X$ and $A$ polyhedral
5222
$\lfloor x\rfloor + \lfloor y\rfloor \leq \lfloor x+y\rfloor$ for every pair of numbers of $x$ and $y$