Book Maths Puzzle Algebra

Describe the solution set in R3 of x1- 4x2 + 3x3 = 0; compare it with the solution set of x1-4x2 + 3x3 = 7?

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Book Other Question

Solve the equation 2A/3 = 8 + 4A

If Leah is 6 years older than her sister, Sue, and John is 5 years older than Leah, and the total of their ages is 41. Then how old is Sue? Need help in solving this linear equations. Thanks

a. y = x + 6
2y - 4x = 6