Proportional Equation Checker
Check whether an equation represents a proportional relationship and identify the constant.
The presence of any constant term b breaks proportionality
Enter any equation to check if it represents a proportional relationship
How to use this checker
Enter an equation. The checker tests whether it can be written as y = kx (no added constant).
What this means in math class
The equation test is the fastest: if it's y = kx with no +b, it's proportional. If there's a +b, it's not.
Worked examples
Example 1: Proportional equation
y = 5x
- Step 1:Check form: y = kx
- Step 2:k = 5, no added constant
Example 2: Non-proportional equation
y = 3x + 2
- Step 1:Check form: y = kx + b
- Step 2:b = 2 is present
Example 3: Fractional constant
y = (2/3)x
- Step 1:Check form: y = kx
- Step 2:k = 2/3, no added constant
Frequently asked questions
What makes an equation proportional?
It must be writable as y = kx with no constant added or subtracted.
Is y = x proportional?
Yes. The coefficient is 1: y = 1x.
Is y = -4x proportional?
Yes. k can be negative. y = -4x is proportional.
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