7x-5y=2 and 3x+y=4,then x=?
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7x - 5y = 2 ---- (i)
3x + y = 4 ----- (ii)
3x + y = 4
→ 5( 3x + y) = 5 × 4 ( multiplying by 5 both sides )
→ 15x + 5y = 20 ---- (iii)
(i) + (iii)
7x - 5y + 15x + 5y = 2 + 20
→ 22x - 5y + 5y = 22
→ 22x + 0 = 22
→ 22x = 22
→ x = 22/22 = 1
Therefore , x = 1
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