Question

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QUESTION:
3x + 2y = 18
2x + 3y = 17
find the value of:
(x + y)/7

Answer 1

Step-by-step explanation:

x=4 and y=3

Step-by-step explanation:

Given : Equation and  

To find : Solve the system of equation by method of cross multiplication?

Solution :

Let Coefficient of x - A

Coefficient of y - B

Constant term - C

Method of cross multiplication is

     x                                    y                                       -1

B       C                      C              A                        A                B

3        -17                    -17             2                       2                  3

-2        -6                    -6              3                       3                  -2

Cross multiply,

     x                                    y                                       -1

 (-18-(34))                       (-51-(-12))                             (-4-9)

   (-52)                               (39)                                  (-13)

Comparing x , i.e.

Comparing y , i.e.

Therefore, The value of x is 4 and the value of y is 3.

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Answer 2

Answer:

{4+3}/7=1

Step-by-step explanation:

1. Use Method of elimination
2. Take the L.C.M of coefficient of first term that is x
3. L.C.M =6,Multiply 1 st eq.by 2and 2nd eq.by in order to make x equals
4. Subtract both the terms
5. After subtracting you will get y=3
6. Substitute value of y in eq1,and get the value of x
7. Value of x=4
8. {x+y}/7=3+4/7. ,7/7. =1
9. Answer is 1
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