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Question -

If (4, 19) is a solution of the equation y = ax + 3, then a =
(a) 3                           
(b) 4
(c) 5            
(d) 6



Answer -

∵  (4, 19) is a solution of equation
y = ax + 3
∴ x = 4, y= 19 will satisfy the equation
∴  19 = a x 4 + 3 = 4a + 3
4a = 19-3 = 16 ⇒ a= 16/4 = 4
∴  a = 4                                      (b)

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