Question
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Two angles are complementary if the sum of their measures is equal to \( 90^{\circ} \). Georgia draws two complementary angles. One of the angles measures \( 15^{\circ} \) more than 2 times the other angle's measure. A. Model with Mathematics Write a system of equations to represent the situation. B. What are the measures of the two angles?

Ask by Weaver Boyd. in the United States
Jan 24,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The two angles measure \( 25^{\circ} \) and \( 65^{\circ} \).

Solution

To model the situation with mathematics, we can represent the measures of the two complementary angles as variables. Let's denote the measure of the smaller angle as \( x \) and the measure of the larger angle as \( y \). Given that one angle measures \( 15^{\circ} \) more than 2 times the other angle's measure, we can write the equation: \[ y = 2x + 15 \] Since the two angles are complementary, their sum is equal to \( 90^{\circ} \), so we can write the equation: \[ x + y = 90 \] Now, we have a system of equations: \[ \begin{cases} y = 2x + 15 \\ x + y = 90 \end{cases} \] To find the measures of the two angles, we need to solve this system of equations. Solve the system of equations by following steps: - step0: Solve using the substitution method: \(\left\{ \begin{array}{l}y=2x+15\\x+y=90\end{array}\right.\) - step1: Substitute the value of \(y:\) \(x+2x+15=90\) - step2: Add the terms: \(3x+15=90\) - step3: Move the constant to the right side: \(3x=90-15\) - step4: Subtract the numbers: \(3x=75\) - step5: Divide both sides: \(\frac{3x}{3}=\frac{75}{3}\) - step6: Divide the numbers: \(x=25\) - step7: Substitute the value of \(x:\) \(y=2\times 25+15\) - step8: Simplify: \(y=65\) - step9: Calculate: \(\left\{ \begin{array}{l}x=25\\y=65\end{array}\right.\) - step10: Check the solution: \(\left\{ \begin{array}{l}x=25\\y=65\end{array}\right.\) - step11: Rewrite: \(\left(x,y\right) = \left(25,65\right)\) The solution to the system of equations is \( (x, y) = (25, 65) \). Therefore, the measures of the two angles are \( 25^{\circ} \) and \( 65^{\circ} \).

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The Deep Dive

Let the measure of the first angle be \( x \) degrees, and the measure of the second angle be \( y \) degrees. From the information provided, we can set up the following system of equations: 1. \( x + y = 90 \) (since the angles are complementary) 2. \( x = 2y + 15 \) (since one angle measures 15 degrees more than 2 times the other) Now, we can substitute the second equation into the first. Substituting \( x \) from the second equation into the first gives us: \[ (2y + 15) + y = 90 \] Combining like terms results in: \[ 3y + 15 = 90 \] To isolate \( y \), subtract 15 from both sides: \[ 3y = 75 \] Dividing by 3 yields: \[ y = 25 \] Now, we can find \( x \) by substituting \( y \) back into the second equation: \[ x = 2(25) + 15 = 50 + 15 = 65 \] Thus, the measures of the two angles are: - \( x = 65^{\circ} \) - \( y = 25^{\circ} \)

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