- How can I effectively prove theorems involving lines, angles, triangles and parallelograms?

It might depend on theorem.

Step-by-step explanation:

Sometimes you should make a value possibly important to the theorem a variable. So if the theorem says something like the inner angle of something is always twice the outer angle of another shape, try making the inner angle x and then seeing if you get 2x for the other, since it means that, regardless of what x equals, the other angle is twice it.

a; x = 0.5

step-by-step explanation:

-10x = -5

x = 0.5

assuming this is from a math graphing problem.

7 would be on the x-axis which is the horizontal line on the graph

84 would be on the y-axis which is the vertical line on the graph