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Which equation represents a linear function?
(A) y=-x^(2)-4
(B) -3x^(2)+1=y
(C) y=x^(2)
(D) x+2=y

Which equation represents a linear function?\newline(A) y=x24 y=-x^{2}-4 \newline(B) 3x2+1=y -3 x^{2}+1=y \newline(C) y=x2 y=x^{2} \newline(D) x+2=y x+2=y

Full solution

Q. Which equation represents a linear function?\newline(A) y=x24 y=-x^{2}-4 \newline(B) 3x2+1=y -3 x^{2}+1=y \newline(C) y=x2 y=x^{2} \newline(D) x+2=y x+2=y
  1. Identify Quadratic Functions: A linear function is of the form y=mx+by = mx + b, where mm and bb are constants, and xx is the variable. The graph of a linear function is a straight line. Let's examine each equation to see if it fits this form.
  2. Analyze Equations: First, look at the equation y=x24y = -x^2 - 4. This is a quadratic function, not a linear function, because it has the term x2x^2, which makes the graph a parabola.
  3. Check for Linearity: Next, examine the equation 3x2+1=y-3x^2 + 1 = y. This is also a quadratic function because of the x2x^2 term. It is not linear.
  4. Identify Linear Function: Then, consider the equation y=x2y = x^2. This is another quadratic function due to the x2x^2 term. It is not linear.
  5. Identify Linear Function: Then, consider the equation y=x2y = x^2. This is another quadratic function due to the x2x^2 term. It is not linear.Finally, look at the equation x+2=yx + 2 = y. This can be rewritten as y=x+2y = x + 2, which is in the form of a linear function, y=mx+by = mx + b, where m=1m = 1 and b=2b = 2.
  6. Identify Linear Function: Then, consider the equation y=x2y = x^2. This is another quadratic function due to the x2x^2 term. It is not linear.Finally, look at the equation x+2=yx + 2 = y. This can be rewritten as y=x+2y = x + 2, which is in the form of a linear function, y=mx+by = mx + b, where m=1m = 1 and b=2b = 2.Since the equation x+2=yx + 2 = y is the only one that fits the form of a linear function, it is the correct answer.

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