1. USING GRAPHS TO SOLVE EQUATIONS

2. Use the graph of y = 2x2 – 5x – 3 to solve these equations
a 2x2 – 5x – 3 = −5
y = 2x2 − 5x − 3
0.5 2
y = −5
a 2x2 – 5x – 3 = −5
Draw the line y = −5
x = or x = 2

3. Use the graph of y = 2x2 – 5x – 3 to solve these equations
b 2x2 – 5x – 6 = 4
y = 2x2 − 5x − 3
y = 7
-1.3
3.8
b 2x2 – 5x – 6 = 4
add 3 to both sides
2x2 – 5x – 3 = 7
Draw the line y = 7
x = −1.3 or x = 3.8

4. Use the graph of y = 2x2 – 5x – 3 to solve these equations
c 2x2 – 5x – 3 = 2x + 4
y = 2x2 − 5x − 3
y = 2x + 4
−0.8
4.3
c 2x2 – 5x – 3 = 2x + 4
Draw the line y = 2x + 4
x = − or x = 4.3