Middle School

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Peter paints a wall at a constant rate of 2 square feet per minute. Assume he paints an area \( y \), in square feet, after \( x \) minutes.

a. Express this situation as a linear equation in two variables.

Answer :

Final answer:

The situation where Peter paints a wall at a rate of 2 square feet per minute can be expressed by the linear equation y = 2x, representing the area painted (y) after a certain number of minutes (x).

Explanation:

Peter paints a wall at a constant rate of 2 square feet per minute. To express the area painted, y, in square feet after x minutes, we can create a linear equation. Since the rate of painting is constant, the equation follows the format of a straight line, y = mx + b, where m represents the slope (rate of painting) and b represents the y-intercept (initial area painted).

In this case, there is no initial area painted at time zero, so the y-intercept b is 0. The rate m is 2 square feet per minute. Therefore, the linear equation representing the situation is:

y = 2x

Where:

y is the area in square feet

x is the time in minutes

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Rewritten by : Barada