Question

Let (-1,2) is a solution of 2x – ay + 6 = 0 then a = ___ [ ]

Answer 1

Answer:

x= -1 & y= 2 .......a = 2

Step-by-step explanation:

2 x -1 - a x 2+ 6 = 0

-2 -2a + 6= 0

-2a = 2 + -6

-2a= -4

a = -4/-2 = 2

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Answer 2

If (-1,2) is a solution of the equation 2x-ay+6=0, it must satisfy it.

Thus, 2x-ay+6 must be equal to zero at (-1,2).

Therefore,

2x - ay + 6 = 0 at (-1,2)

2(-1) - a(2) + 6 = 0

-2 - 2a + 6 = 0

4 - 2a = 0

2a = 4

a = 2