Trevor has a family photograph that measures 4 inches wide and 6 inches long. He wants to enlarge the photo and hang it on the w
1 answer:
Answer:
20 inches
Step-by-step explanation:
To solve this problem, we need to cross multiply. Lets input the values (4, 6, 30) as shown below:
Next we cross multiply. We multiply 4 and 30, and we multiply 6 and <em>x</em>.
Now, lets put the values above back into the equation:
Our last step is to divide 120 by 6 to get <em>x </em>by itself.
The answer is 20 inches.
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Given:
The system of equations:
To find:
The number that can be multiplied by the second equation to eliminate the x-variable when the equations are added together.
Solution:
We have,
...(i)
...(ii)
The coefficient of x in (i) and (ii) are 1 and respectively.
To eliminate the variable x by adding the equations, we need the coefficients of x as the additive inverse of each other, i.e, a and -a So, a+(-a)=0.
It means, we have to convert into -1. It is possible if we multiply the equation (ii) by -5.
On multiplying equation (ii) by -5, we get
...(iii)
On adding (i) and (iii), we get
Here, x is eliminated.
Therefore, the number -5 can be multiplied by the second equation to eliminate the x-variable.