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How can I solve this in linear equations in two variables

Mr. Salonga has two investments. His total investment is Php 400,000.

Annually, he receives 3% interest on one investment and 7%

interest on the other. The total interest that Mr. Salonga receives

in a year is Php 16,000.

a. How much money does Mr. Salonga have in each investment?

b. In which investment did Mr. Salonga earn more?

c. Suppose you were Mr. Salonga, in which investment will you

place more money? Why?

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