A system of linear equations is a set of two or more equations taken together.

5)The graph of f is given. State the numbers at which f is not differentiable.
x=?(smaller value)
x=?(larger value)

6)The graph of f is given. State the numbers at which f is not differentiable.
x=?(smaller value)
x=?(larger value)

Find the point on the line $y=5x+2$ that is closest to the origin.

Subtract ${\displaystyle 5y^2-6y-11}$ from ${\displaystyle 6y^2-2y+5}$

What is $4\sqrt{3}$ minus $4\sqrt{3}$?

At the beginning of an environmental study, ad forest covered an area of $1500k{m}^2$.Since then, this area has decreased by 3.75% each year.Let t be the number of years since the start of the study.Let y be the area that the forest covers in $k{m}^2$.
Write an exponential function showing relationship between y and t.

To determine:
The value of the expression -21.7+14.2.

Solve the system of equations:
$\begin{array}{c}2x^5-2x^{3}y-x{y}^2+10x^3+y^2-5y=0\\ (x+1)\sqrt{y+5}=y-3x^2+x-2\end{array}$