What are the 3 conditions that a graph must possess in order for it to be a proportional graph?

The 3 things in order for a graph to be proportional is:

This means that as x increases, y increases and as x decreases, y decreases-and that the ratio between them always stays the same. The graph of the proportional relationship equation is a straight line through the origin.

Step-by-step explanation:

BRAINLIEST???

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second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

1. supplementary angles

2. acd and bcd

step-by-step explanation: