Question

1. हल कीजिए:
5x+7y-31=0
7x-9y+13= 0​

Answer 1

Answer:

x=2 y=3

Step-by-step explanation:

5x+7y-31=0 ____eq(1)

7x-9y+13=0 ____eq(2)

eq(1) *7 & eq(2)*5

then it becomes,

35x+49y-217=0 _____eq(3)

35x-45y+65=0 ____eq(4)

subtracting eq(3) & eq(4)

35x+49y-217-(35x-45y+65)=0

35x+49y-217-35x+45y-65=0

94y-282=0

94y=282

y=282/94

y=3

putting the value of y in eq(1)

5x+7*3-31=0

5x+21-31=0

5x-10=0

5x=10

x=10/5

x=2

the value of x is 2 & value of y is 3.