Last year Sarah invested money in two accounts. The first account had an interest rate of 4% and the second account had an interest rate of 5%. If she invested $800 more in the first account than the second and her total interest income was $509, how much did she invest at each rate? Step 2 of 3 : Use the table from part 1 to help write a linear equation that represents the given word problem. (Use x to represent the unknown quantity.) Do not simplify your answer.