Question

7) Which of the following is' NOT'a
solution of the equation 3x + y = 5*
O (1,2)
O (2, -1)
O (-2, 1)
O (-1, 8)​

Answer 1

Step-by-step explanation:

when,

(x,y)=1,2

then,

3x+y=3×1+2

=5

hence (1,2)is a solution of 3x+y

also when(x,y)=(2,-1)

3x+y=3×2+(-1)

=5

hence (2,-1)is a solution of 3x+y

when(-2, 1)=(x,y)

3x+y=3×-2+1

=5

hence (-2,1)is a solution of 3x+y

when (x,y)=(-1,8)

3x+y=3×-1+8

=5

therefore all options are solution of 3x+y