📐 GRADIENT HUNT 🕵️♀️
A secret code is hiding inside a line. Can you find the GRADIENT (the steepness)?
Your mission: find the number that tells you how steep this line is. That number is the GRADIENT! 💪🏾
🧗 WHAT IS GRADIENT? (Steepness)
Gradient means how much a line goes up or down when you move one step to the right. We see gradients every day!
| 📌 Real-life example | What the gradient means |
|---|---|
| 🏔️ Mountain road (very steep) | Gradient = large number, e.g. 21 (goes up 2 metres for every 1 metre forward) |
| 🏞️ Gentle ramp (wheelchair access) | Gradient = small fraction, e.g. 112 |
| 📏 Flat road | Gradient = 0 (no rise) |
| ⬇️ Downhill slide | Gradient = negative number, e.g. –12 |
✍️ THE LINE WE ARE INVESTIGATING
Our line is written as:
🔍 Where is the gradient hidden? In the number that multiplies x (the coefficient of x).
📚 STEP-BY-STEP GUIDE (no formulas memorized – just match!)
✅ Step 1 – Remember the family of straight lines
Any straight line can be written as:
We often call gradient the letter m.
✅ Step 2 – Compare with your line
Your line: y = 13 x + 7
So the number beside x is 13 (one-third).
✅ Step 3 – That number IS the gradient!
✅ Gradient = 13
🎯 YOUR TURN!
What is the gradient of the line y = 13 x + 7 ?
Gradient = ___________
🚶 WHAT DOES A GRADIENT OF 13 MEAN?
- 👉 Move 3 steps to the right (increase x by 3)
- 👆 The line goes UP by 1 step
✅ Gradient = rise ÷ run : rise = 1 , run = 3
So for every 1 unit you move right, the line goes up by only 13 of a unit. It is a gentle slope.
📈 gentle upward slope
🏗️ REAL-LIFE CONNECTION (CBC Competency)
In Kenya, when building a ramp or a road, engineers use gradient. A gradient of 13 means the road rises 1 metre for every 3 metres horizontally. That is safe for cars and bicycles.
Gradients help us design safe paths, roofs, and even water drainage!
📋 SELF CHECK (tick what you understood)
- ✅ I can find the gradient by looking at the number before x.
- ✅ I know that gradient = rise / run.
- ✅ I can read a fraction like 13 as "one third".
- ✅ I can explain that a gradient of 13 means a gentle upward slope.
✅ GRADIENT – CORRECT ANSWER
Well done! You have successfully decoded the steepness of the line 🎉
Full equation: y = (1/3)x + 7 ➜ Gradient = 13 ; y-intercept = 7
📍 Keep practicing gradients – you are becoming a maths detective! 🕵️♀️
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