Find $x$ from $xy = 12$, $yz = 20$, and $zx = 15$ Date of Exam May 2019 Subject Mathematics, Surveying and Transportation Engineering Problem Solve for x from the following equations: $xy = 12$ $yz = 20$ $zx = 15$ A. 2 C. 4 B. 3 D. 5 Answer Key Click here to show or hide the answer key [ B ] Solution Click here to expand or collapse this section Multiply $xy \cdot yz \cdot zx = 12 \cdot 20 \cdot 15$ $x^2 y^2 z^2 = 3600$ $(xyz)^2 = 3600$ $xyz = 60$ Divide $\dfrac{xyz}{yz} = \dfrac{60}{20}$ $x = 3$ ← answer Category Algebra Simultaneous Equations Three Equations, Three Unknowns system of non-linear equations Log in or register to post comments