Track / Stage 4 / 93 of 340 #353 of 1964

Problem 353

AMC 12 late, AIME early

Geometry Difficulty 4.6 Find the answer

In an isosceles triangle with a perimeter of 30, the base length is $y$ , and the leg length is $x$ . The functional relationship between $y$ and $x$ is $y=$ $\qquad$ .

Your answer

A number or a short expression. Fractions can be typed as 3/2, and spacing doesn't matter.

Official solution

1) $30-2 x\left(\frac{15}{2}<x<15\right)$

Source: NuminaMath-1.5, licensed Apache-2.0. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project.