Retirement Income | Linear Equation Model | Algebra 1

A retired woman has $500,000 to invest but needs to make $60,000 a year from the interest to meet certain living expenses. One bond investment pays 15% annual interest. The rest of it she wants to put in a CD that pays 7%. Set up and solve the equation for how much the woman should invest in each option to sustain a $60,000 annual return.
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