Solve x + y = 5 and x − y = 1
Add the two equations to get 2x = 6, so x = 3. Substitute into x + y = 5 to find y = 2.
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Problem: 2x + 5 = 17
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Add the two equations to get 2x = 6, so x = 3. Substitute into x + y = 5 to find y = 2.
Translate the sentence into d = rt. Substitute r = 40 and t = 2 to get 80 miles. Units stay in miles.
Add 2 + 4 + 6 + 8 = 20, then divide by 4. The mean uses every value, so outliers would pull it.
On the unit circle, 30° corresponds to y-coordinate 1/2. In a 30-60-90 triangle, opposite/hypotenuse is also 1/2.
a² + b² = c². 9 + 16 = 25, so c = 5. The theorem applies only when one angle is 90°.
A = πr². With r = 5, A = 25π. Do not substitute a decimal for π unless the problem asks for an approximation.
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