How to make consideration of equation y = (1) 2x. Is that every time the value x into the equation for y, 1 up, one always. For example, when the substitution x = 1, y = 2, only a single value. Instead, x = 2, y = 4, only a single value. Instead of x = 3, y = 6, only a single value. Therefore conclude that f is a function. (2) consider the equation y = x2 When the substitution x = 1, y = 1, only a single value. Instead, x = 2, y = 4, only a single value. Instead of x = 3, y = 9 made up just a single value. Therefore conclude that g is a function. (3) consider the equation y2 = xWhen the substitution x = 1, y = ± 1, there will be 2, which means that there is a double top (1,-1) and (1, 1) h. Therefore, h is not a function.(4) consider the equation y = x | |. When the substitution x = 2, y = 2, which is | |. y = 2,-2. Therefore, F is not a function.
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