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- A short, 2-minute Session
- Pick the matching graph
- Review your answers in Progress
Functions · SumNinja
Match graphs to equations
Connect a function rule with the shape of its graph, starting with straight lines.
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Try a warm-up
Take your time. You can try again.
Which point is on the line y = 2x + 4?
Get a hint
The first number is x. Put it into the rule to find y.
Choose an answer when you’re ready.
See the answer and why
(1, 6)
When x = 1, y = 2 × 1 + 4 = 6.
How Functions practice works
A function rule tells you which output y goes with an input x. A graph draws those pairs as points. In the matching game, choose the graph that follows the given rule.
Read the rule, then look for its shape
For y = 2x + 4, the graph crosses the y-axis at 4. Each step of 1 to the right raises y by 2. Those two clues help you tell it apart from lines with a different slope or starting height.
See how it works
y = 2x + 4
When x = 0, y = 4. When x = 1, y = 6. The matching line passes through both (0, 4) and (1, 6).
y = x²
Both x = 2 and x = −2 give y = 4. Its U-shaped graph is symmetric around the y-axis, unlike a straight line.
The first button starts with straight lines. Choose a lesson below to explore other shapes, such as U-shaped curves and waves. Each lesson links to its own practice. You can also match a rule to a graph or find values.