(3x+5y)&(5x+3y) mulatiply
Answers
Answer:
15x square + 36xy + 15y sqaure
Step-by-step explanation:
3x + 5y = 9 and 5x + 3y = 7. What is the value of x+y?
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53 Answers

Anand Shaw, M.Tech Civil Engineering & Structural Engineers, Indian Institute of Technology, Mandi (2020)
Answered September 4, 2020
These is a problem of linear equations.
The problems of can be solved by two different methods…
Elemination
Substitution
Here we will discuss about the elemination techniques.
As the name suggest that we need to eleminate the variables (either x or y) to get the answer. Let's understand with the help of an example.
Given eqn
3x+5y=93x+5y=9
5x+3y=75x+3y=7
In order to eleminate “x”we need to make the co-efficient of “x” same on both the equation.
To achieve this
we will multiply 5 with equation 1
And multiply 3 with equation 2
On multiplication it will look like….
15x+25y=4515x+25y=45
15x+9y=2115x+9y=21
Now we will substract equation 1 and 2, it will give,
16y=2416y=24
y=1.5y=1.5
Now, we will put y = 1.5 in equation 1 and solve
Upon solving we get,
x=0.5x=0.5
Now, we got both x and y.
So, x+y=0.5+1.5=2x+y=0.5+1.5=2
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