Solve using Substitution method 1 y x 4 x 3y 12 Solve us

Solve using Substitution method. 1. y = x - 4 x + 3y = 12 Solve using elimination by addition method. 2. 7x + 12y = -1 5x - 3y = 7 Solve using Augmented matrix method. 3. 2x_1 - 3x_2 = -8 5x_1 + 3x_2 = 1

Solution

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y = x - 4 ..............................................(1)

x + 3y = 12 ..........................................(2)

Substituting value of y in equation (2)

x + 3 (x - 4) = 12

4x - 12 = 12

4x = 24

x = 6

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

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