Graph questions in JAMB usually come from topics like linear equations, quadratic functions, and inequalities. These questions may look scary at first, but once you understand what the graph is showing and what the question is asking, you’ll see they are often easier than expected.
JAMB won’t ask you to draw graphs. Instead, you’ll likely be asked to read, interpret, or solve simple graph-based problems. This guide will show you how to handle graph questions the easy way and score full marks.
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What to Expect in Graph Questions
Most graph-related questions in JAMB fall into one of these three categories:
- Reading points from a graph (coordinates, slope, intercepts)
- Understanding straight-line equations (y = mx + c)
- Solving quadratic equations using graph-related values
The goal is to check if you can connect equations with the visual information in the graph.
Understanding Straight-Line Graphs
The most common graph JAMB uses is the straight-line graph, based on the equation:
y = mx + c
Where:
- m is the slope (or gradient)
- c is the y-intercept (where the line crosses the y-axis)
If you’re given two points, you can calculate the slope using:
m = (y₂ – y₁) / (x₂ – x₁)
Once you have the slope and one point, you can find the full equation of the line. JAMB may give you the graph and ask:
- What is the slope?
- What is the value of y when x = 3?
- What point does the graph cross the y-axis?
These are all easy if you understand how to read from a graph and use simple substitution.
DOWNLOAD: JAMB Syllabus for Mathematics 2025/2026 PDF
Understanding Parabolic (Quadratic) Graphs
Sometimes JAMB asks questions involving curves, especially the graph of a quadratic equation like:
y = ax² + bx + c
You’re not expected to draw it, but you might be asked:
- What are the turning points or maximum/minimum value?
- What is the axis of symmetry?
- What are the roots (x-intercepts)?
The roots are where the curve crosses the x-axis. These are the solutions to the equation ax² + bx + c = 0. You can either solve it directly or read it from a graph if one is given.
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Tips for Answering Graph Questions in JAMB
- Read every label on the graph carefully
- Use the scale to get the correct values
- If it’s a straight-line graph, focus on the slope and where it crosses the y-axis
- For curves, check where it touches or cuts the x-axis—those are the roots
- Don’t guess—use simple substitution if you’re given an equation
JAMB is not testing drawing skills. They’re testing how well you understand what the graph represents.
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Final Words
Graphs in JAMB 2025 are nothing to fear. The key is understanding how equations and shapes connect on the graph. With basic knowledge of slopes, intercepts, and symmetry, you can handle any graph-related question confidently.
As always, the more past questions you solve, the easier this gets.