Write 12,430,000 in expanded form

In this question, you are given standard form number and asked to make it in expanded form. In the expanded form you need to write the number value in separate for every different digit. In this question, 12,430,000  have 4 number that can be expressed. 
Then 12,430,000 in the expanded form would be: 10,000,000+2,000,000+400,000+30,000

$7.50x+$4.50y=midk it's been awhile since i've done one of these