Question

Find the value of a & b if (–1, 2) is solution

of ax + y + 1 = 0 and 2x + by + 8 = 0.​

Answer 1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

x = -1 , y = 2

=>ax + y + 1= 0

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

=>- a + 3 = 0

so,a = 3

Now, 2× -1 + b ×2 + 8 = 0

=> - 2 + 2b + 8 = 0

=> 2b + 6= 0

=> 2b = -6

. b = 6/-2

. b = - 3