Answer:
$3500.
Explanation:
Let x be the amount contributed by Edison to his 401(k) plan.
We have been given that Edison’s employee matches 20% of Edison’s contributions to his 401(k) plan. Edison’s employer contributed $700 to the plan last year.
To find the Edison's contribution we need to find x such that 20% of x equals 700. We can represent this information in an equation as:



Let us divide both sides of our equation by 0.20.


Therefore, Edison contributed $3500 to the plan last year.