Subjects algebra

Graph Identification 39F257

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Question: Which of the following graphs represents the equation $2x - 2y = 36$?
1. **State the problem:** We need to identify which graph corresponds to the equation $$2x - 2y = 36$$. 2. **Rewrite the equation in slope-intercept form:** $$2x - 2y = 36$$ Subtract $2x$ from both sides: $$-2y = -2x + 36$$ Divide both sides by $-2$: $$y = \cancel{\frac{-2x}{-2}} + \cancel{\frac{36}{-2}}$$ Simplifying the cancellations: $$y = x - 18$$ 3. **Interpret the slope-intercept form:** The equation is $$y = x - 18$$, which means: - The slope is $1$ (positive slope). - The y-intercept is $-18$. 4. **Check the x-intercept:** Set $y=0$: $$0 = x - 18 \implies x = 18$$ So the line crosses the x-axis at $(18, 0)$. 5. **Match with the graphs:** - Graph A: negative slope, crosses x and y near $-18$. - Graph B: positive slope, crosses x near $-18$, y near $18$. - Graph C: positive slope, crosses y near $-20$, x near $36$. - Graph D: positive slope, crosses y near $-18$, x near $18$. Since our line has positive slope, y-intercept $-18$, and x-intercept $18$, **Graph D** matches. **Final answer:** Graph D represents the equation $2x - 2y = 36$.