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If (4, 19) is a solution of the equatio...

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

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(4, 19) is a solution of the equation`y=a x+3,\ `
it satisfies the equation
putting the value of `x=4andy=19`
`19=a(4)+3`
`a=4`
so ans is (b)4
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