Use cramer's rule to solve system of linear equations13x-6y=1726x-12y=8

Find the linear approximation of the function $f(x)=\sqrt{4-x}$ at $a=0$
Use L(x) to approximate the numbers $\sqrt{3.9}$ and $\sqrt{3.99}$ Round to four decimal places

Do the equations $5y-2x=18$
and
$6x=-4y-10$
form a system of linear equations? Explain.

If a given population has a constant growth rate over time and is never limited by food or disease, it exhibits exponential growth.

I have a set of linear equations, of the form Ax=b . However, the value of b depends on the sign of the solution of x, such that
${\displaystyle b_i=c_i+d_i}$ if ${\displaystyle x_i>0}$, and ${\displaystyle b_i=c_i-d_i}$ if ${\displaystyle x_i<0}$.
I could solve this by trying each combination of positiveness of x, but that would require solving ${\displaystyle 2^N}$ sets of linear equations, which becomes unfeasible quite quickly.
Is this solvable analytically?

Reduce the system of linear equations to upper triangular form and
$2x+3y=5$
Solve
$-y=-2+\frac{2}{3}x$

Find the equation of the line with slope = -3 and passing through (-3,5). Write your equation in point-slope AND slope-intercept forms.
point-slope form:
slope-intercept form:

I have the equation ${\displaystyle (1+y^2)dx+(xy+1)dy=0}$. It is a linear differential equation of the first order. Now the problem is that this doesnt have the regular form of this type of equations which is
${\displaystyle \frac{dy}{dx}+p\left(x\right)y=q\left(x\right)}$.
I know I can divide both sides by dx and then I'll have ${\displaystyle (1+y^2)+(xy+1)y^{\prime }=0}$. Still, it should be ${\displaystyle (xy+1)+y^{\prime }}$ not ${\displaystyle (xy+1)y^{\prime }}$.