Is This Graph Proportional? Checker
Enter points or values to check whether a graph shows a proportional relationship and why.
Two conditions for a proportional graph
Enter points as x,y separated by spaces
How to use this checker
Enter at least two points from the graph. The checker tests whether the line passes through (0,0) and whether all y÷x ratios match.
What this means in math class
Teachers ask two questions: is the line straight, and does it go through the origin? This checker automates both tests.
Worked examples
Example 1: Proportional graph
Points: (0,0), (2,6), (4,12)
- Step 1:Check origin: first point is (0,0) ✅
- Step 2:Check ratio: 6÷2 = 3
- Step 3:Check ratio: 12÷4 = 3
- Step 4:All ratios equal 3 ✅
Example 2: Non-proportional graph
Points: (0,2), (2,8), (4,14)
- Step 1:Check origin: first point is (0,2) ❌
- Step 2:Not through the origin
- Step 3:Relationship is linear but not proportional
Frequently asked questions
What makes a graph proportional?
A straight line that passes through the origin (0,0).
Can a curved line be proportional?
No. Proportional graphs are always straight lines.
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