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In the given graph the coordinates of M1 are

(a) x1 = 5, x2 = 30

(b) x1 = 20, x2 = 16

(c) x1 = 10, x2 = 20

(d) x1 = 20, x2 = 30

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(c) x1 = 10, x2 = 20

4x1 + 2x2 = 80 (or) 2x1 + x2 = 40

2x1 + x2 = 40 … (1)

2x1 + 5x2 = 120 … (2)

(1) – (2) ⇒ -4x2 = -80

x2 = 20

But, 2x1 + x2 = 40

2x1 + 20 = 20

x1 = 10

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