book Maths Puzzle Numerical Ability

Help Please!
Problem:
Jon and Lauren have a combined income of 48,000. Lauren earns 3,000 more than half of what Jon earns. How much does each earn?

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book Other Question

If log8 (little 8)M= log5 (little 5)7/log5(little 5)8, then M = ? I would appreciate it if a tutor could please verify my answer to the following problem.

Use substitution to solve for y: (y+5)^2-4(y+5)-12=0

My answer:

Substituted