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⇒ y = x/4

4x + 3y = 19

⇒4x + 3(x/4) = 19

⇒4x +3x/4 = 19

⇒(16x + 3x)/4 = 19

⇒19x/4 = 19

⇒ 19x = 19*4 = 76

⇒ x = 76/19 = 4

Now, y = x/4 = 4/4 = 1

Check : 4x+3y=19

⇒4(4) + 3(1) = 19

⇒16+3 = 19

⇒19=19

Therefore L.H.S = R.H.S .........