Question: In Exercises 19-28, solve the system of linear equations using the substitution method. (See Example 4.) 19. -2x + y + 6z =1 3x +

In Exercises 19-28, solve the system of linear equations using the substitution method. (See Example 4.) 19. -2x + y + 6z =1 3x + 2y + 5z = 16 21. xty+ z = 4 5x + 5y + 5z = 12 7x + 3y - 4z = 11 x - 4y+z=9 33. Use a linear system to solve: The triangle has a perimeter of 65 feet. What are the lengths of sides , m, and n? 1 = m n = 1+ m - 15 m

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