<span>From the problem, you can get this equation: Jane is 2 years older than Sally J=z+2 David is 4 times older than Jane. D=4J
</span>Write two equivalent expressions that represent David’s age in terms of Sally’s age, z, and explain how the two expressions relate to one another.<span>Sally is z years old. From the 2 equation above, you can get: </span>D=4J D=4(z+2) D=4z+8
D-8=4z (D-8)/4=z The two equivalent expression would be D=4z+8 and (D-8)/4=z
The expression that more usefull would be D=4z+8 if you want to determine David age.
