standard_description: Use similar triangles to explain why the slope m is the same between any two distinct points on a non-vertical line in the coordinate plane; derive the equation y = mx for a line through the origin and the equation y = mx + b for a line intercepting the vertical axis at b.
problem_activity: Problem 1
Which of these expressions can be used to find the product
$$20\times41$$
? Select the
two
correct answers.
Problem 2
Solve. Show or explain your work.
$$32\times60$$


aligns: no