Pregunta
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Graph the equation \( 5 y-4 x=-20 \) and identify the y-intercept. To graph a linear equation, two points are essential to determine a straight line. In this case, use the two points determined by the first and third rows of the table above. The remaining point, (5,0), can be used as a check. Use the graphing tool to graph the line using two points.

Ask by Paul Joseph. in the United States
Mar 14,2025

Solución de inteligencia artificial de Upstudy

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To graph the equation \(5y - 4x = -20\), first solve for \(y\) to get \(y = \frac{4}{5}x - 4\). The y-intercept is at \((0, -4)\). Plot the points \((0, -4)\) and \((-5, -8)\), then draw a straight line through them. The y-intercept is \((0, -4)\).

Solución

1. Begin with the given equation: \[ 5y - 4x = -20 \] 2. Solve for \(y\) to put the equation in slope-intercept form. Add \(4x\) to both sides: \[ 5y = 4x - 20 \] Then divide both sides by 5: \[ y = \frac{4}{5}x - 4 \] 3. The equation is now in the form \(y = mx + b\), where the y-intercept is the point: \[ (0, -4) \] 4. Pick two points from the table for graphing. Using the first row, when \(x = 0\): \[ y = \frac{4}{5}(0) - 4 = -4 \] This gives the point \((0, -4)\). 5. Using the third row of the table, choose a value that is not \((5,0)\) (which is reserved as a check). For example, let \(x = -5\): \[ y = \frac{4}{5}(-5) - 4 = -4 - 4 = -8 \] This gives the point \((-5, -8)\). 6. Plot the two points \((0, -4)\) and \((-5, -8)\) on the coordinate plane, then draw the straight line through these points. 7. As a check, verify that the point \((5,0)\) lies on the line. Substitute \(x = 5\) into the equation: \[ y = \frac{4}{5}(5) - 4 = 4 - 4 = 0 \] Since the calculation gives \(y = 0\), the point \((5, 0)\) is indeed on the line. The y-intercept of the graph is \((0, -4)\).

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The Deep Dive

To graph the equation \(5y - 4x = -20\), let's first manipulate it into slope-intercept form \(y = mx + b\). Rearranging gives us \(5y = 4x - 20\) and then \(y = \frac{4}{5}x - 4\). From this, we identify that the y-intercept is \(-4\) (the value of \(b\)). Next, we can identify two points for plotting. When \(x = 0\), \(y = -4\) gives us the point (0, -4). When \(x = 5\), substituting into the equation gives \(y = 0\) resulting in the point (5, 0). Plot these points on the graph and draw a straight line through them. For an additional check, (5, 0) already aligns with our calculations!

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