Question
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Solve each system by graphing. \( \begin{array}{l}\text { 28) } \\ y=-3 x+3 \\ y=-\frac{1}{2} x-2\end{array} \)

Ask by Williams Washington. in the United States
Jan 23,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The solution is \( x=2 \) and \( y=-3 \).

Solution

Solve the system of equations \( y=-3x+3;y=-\frac{1}{2}x-2 \). Solve the system of equations by following steps: - step0: Solve using the substitution method: \(\left\{ \begin{array}{l}y=-3x+3\\y=-\frac{1}{2}x-2\end{array}\right.\) - step1: Substitute the value of \(y:\) \(-3x+3=-\frac{1}{2}x-2\) - step2: Multiply both sides of the equation by LCM: \(\left(-3x+3\right)\times 2=\left(-\frac{1}{2}x-2\right)\times 2\) - step3: Calculate: \(-6x+6=\left(-\frac{1}{2}x-2\right)\times 2\) - step4: Calculate: \(-6x+6=-x-4\) - step5: Move the expression to the left side: \(-6x+x=-4-6\) - step6: Add and subtract: \(-5x=-4-6\) - step7: Add and subtract: \(-5x=-10\) - step8: Change the signs: \(5x=10\) - step9: Divide both sides: \(\frac{5x}{5}=\frac{10}{5}\) - step10: Divide the numbers: \(x=2\) - step11: Substitute the value of \(x:\) \(y=-3\times 2+3\) - step12: Simplify: \(y=-3\) - step13: Calculate: \(\left\{ \begin{array}{l}x=2\\y=-3\end{array}\right.\) - step14: Check the solution: \(\left\{ \begin{array}{l}x=2\\y=-3\end{array}\right.\) - step15: Rewrite: \(\left(x,y\right) = \left(2,-3\right)\) The solution to the system of equations \(y=-3x+3\) and \(y=-\frac{1}{2}x-2\) is \(x=2\) and \(y=-3\).

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Extra Insights

To graph the system of equations, start with the first equation, \( y = -3x + 3 \). This line has a y-intercept at (0, 3) and a slope of -3, meaning for every step to the right on the x-axis, the line goes down 3 steps. Plot a few points, such as (1, 0) and (2, -3), and draw the line through them. Next, graph the second equation, \( y = -\frac{1}{2}x - 2 \). Here, the y-intercept is (0, -2) and the slope is -1/2, which means for every 2 steps to the right, the line goes down 1 step. Plot points like (2, -3) and (4, -4) and draw this line as well. Where these two lines intersect is the solution to the system. In this case, you’ll find that they intersect at (2, -3).

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