(-2, 1) is a solution for which of the following equations?
1 answer:
You might be interested in
Answer:
0.4kg, 1.4kg and 1.8kg
Step-by-step explanation:
Given parameters:
Mass of alloy = 3.6kg
Ratio of elements in the alloy = 2:7:9
Unknown:
Mass of each element in the alloy = ?
Solution:
To find the mass of each element in the alloy, first find the sum of the ratio;
2+7+9 = 18
Mass of nickel = x 3.6 = 0.4kg
Mass of zinc = x 3.6 = 1.4kg
Mass of copper = x 3.6 = 1.8kg
The mass of each metal is 0.4kg, 1.4kg and 1.8kg
It is related to econometrics, however using simple algebraic logic we can solve this problem. General formula with residual is 
, where r is a residual. Plugging the pair into the formula, we obtain that 
and r=0.5