To check this, you substitute the values for x and y into the equation. At (1,2) x equals 1 and y equals 2 so substituting this in we get:
x + 2y = 1 + 2(2) = 1 + 4 = 5
And since it equals 5 like in the original equation the point is represented by it.
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q2
-4
in the equation: y=mx+b , the y-intercept is represented by "b".
(4, 1)
The second