Grade 8 Math Worksheets
Straight lines can describe phone plans, road trips, and savings goals. Learn y = mx + b and you can predict the future (mathematically)!
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What your child will learn: Linear Equations & Functions
- A function is a rule: each input gets exactly one output. Think vending machine: press B4, get one snack.
- y = mx + b is a line: m is the slope (steepness), b is the y-intercept (starting point).
- Slope = rise/run = change in y ÷ change in x. Between (1,3) and (3,7): slope = (7−3)/(3−1) = 2.
- Real life: cost = 0.10 × texts + 20 is a line! $20 flat fee (b), 10 cents per text (m).
Sample worksheet questions
1. Solve for x: 8x + 3 = 59
Answer: x = 7
2. Find the slope between (2, 4) and (6, 20). ____
Answer: 4
3. If f(x) = 2x + 2, find f(6). ____
Answer: 14
4. Solve for x: 5x + 3 = 38
Answer: x = 7
5. Find the slope between (4, 1) and (8, 9). ____
Answer: 2
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💰 Savings Forecast: Write an equation for your savings if you start with what's in your piggy bank and add a set amount weekly. When will you afford your goal?
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