Question

5) Resuelve:
x+y = 1
2x – 3y = 7/2
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Answer 1

x+y = 1

x + y = - 1 = 1 - 1

= x + y - 1 = 0

____________________________

2x – 3y = 7/2

2x - 3y - 7/2 = 7/2 - 7/2

2x - 3y - 7/2 = 0

2(2x - 3y - 7/2) = 2 × 0

2 × 2x - 2 × 3y - 2 × 7/2 = 0

= 4x - 6y - 2 × 7/2 = 0