Chapter 15 focuses on solving equations graphically and comparing two equations derived from linear functions. Key objectives include understanding the slope and y-intercept of straight lines, as well as finding values of y for various lines. Activities include comparing equations and solving specific problems graphically, with a homework assignment involving related exercises.

1. Chapter 15
Solving Equation Graphically

2. Starter
y = 3x + 5
y = 5x – 2
y = -2x + 7
y = ½x + 9
y = -¼x – 3
y = 4
y = x

3. Introduction

4. Form of a straight line
𝑦 =𝑚𝑥+𝑐
Gradient
‘steepness or
slope’
y-intercept
Where the graph crosses the y-axis
When x = 0, what is y?
y-
intercept

5. Objectives
O Compare two equations
O Solve equations graphically.

6. Objective 1: Compare two
equation
O L1: and L2:
Means y = 1
O L1: and L2:
Means y =0

7. O L1: L2:
Means y =3
O L1: L2: -1.5
L2: -1.5
Means y =-1.5

8. Activity 1
O Compare equation L1 with Given equations and find
value of y.
O L2:
O L3:
O L4 :

9. Objective 2: Solve equation
Graphically
a)
means y =0
X = 1.7
b)
means y =3
X = -0.4
c)
means y =-1.5
X = 2.5

10. Activity 2

11. Q3 Page no. 269
a) 1.9x = 4.42
2,7y +1.9x = 4.42
2.7y +4.42 = 4.42
2.27 y = 0
y = 0
b) 2.7y = 4.42
y = 4.42/ 2.7
y = 1.6

12. Plenary
O Summarize class in 2min challenge.

13. H.W. TND
O Page 269 Exercise 15D Q2 or Q4
O TND Parallel Lines