1986 AIME Problems/Problem 4: Difference between revisions
| Line 14: | Line 14: | ||
Subtracting the first equation from every one of the other equations yields | Subtracting the first equation from every one of the other equations yields | ||
<cmath>\begin{align*} | <cmath>\begin{align*} | ||
x_2-x_1&=6 | x_2-x_1&=6\\ | ||
x_3-x_17&=18\\ | |||
x_4-x_1&=42\\ | |||
x_5-x_1&=90 | |||
\end{align*} | \end{align*}</cmath> | ||
== See also == | == See also == | ||
Revision as of 14:12, 22 August 2019
Problem
Determine 
if 
, 
, 
, 
, and 
satisfy the system of equations below.
Solution
Adding all five equations gives us 
so 
. Subtracting this from the fourth given equation gives 
and subtracting it from the fifth given equation gives 
, so our answer is 
.
Solution 2
Subtracting the first equation from every one of the other equations yields
See also
| 1986 AIME (Problems • Answer Key • Resources) | ||
| Preceded by Problem 3 |
Followed by Problem 5 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 | ||
| All AIME Problems and Solutions | ||
- AIME Problems and Solutions
- American Invitational Mathematics Examination
- Mathematics competition resources
These problems are copyrighted © by the Mathematical Association of America. 
