Book Maths Puzzle Algebra

Need help in solving this linear equations. Thanks

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

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Book Other Question

Describe the solution set in R3 of x1- 4x2 + 3x3 = 0; compare it with the solution set of x1-4x2 + 3x3 = 7? need step by step explanation in solving this linear equation

y = x = 6
2y - 4x = 6