standard_description: Use variables to represent quantities in a real-world or mathematical problem, and construct simple equations and inequalities to solve problems by reasoning about the quantities.
problem_activity: Problem 1
Is 8 a solution to
$$\frac{3}{8}x-5=-2$$
? Show or explain why or why not.
Problem 2
Is
$$-2$$
a solution to
$$10-2x=4+x$$
? Show or explain why not.
Problem 3
Write an equation with
$$x=9$$
as a solution.
Problem 4
Write an equation with
$$x=0$$
as a solution.


aligns: no