Question

Q.1 Choose the correct alternative answer for following MCQ'S.
1) If 3x+5y=9 and 5x+3y=7 then what is the value of x+y?
a) 2
b)16
c)9
d)
2) Which of the following is not a linear equation?
a) x+y=3
b)x-2y=3
c)x-7=y d)xy=3
3) if 6:5 = y:20 then what will be the value of y?
a)15
b) 24
c)18
d) 22.5
4)what is the mean proportional of 8 and 18?
a) 26
b)13
c) 12
d)10
5) what is the percentage form of 7/10.
a)70%
b)700%
c)0.07%
d)0.7%​

Answer 1

6 is the write answer baby all questions is easy

Answer 2

Answer:

Step-by-step explanation:

1. 3x+5y=9 is 1st equation

5x+3y=7 is 2nd equation

Adding 1st and 2nd equations ,we get

3x+5y +5x+3y ==9+7

8x+8y=16

8 (x+y)=16

x+y=16/8

x+y=2 is the answer.

2. x-7=y is not a linear equation .

3. 6:5=y:20

5×y=6×20

y=6×20/5

y=6×4

y=24.

4. Mean of 8 and 18

=8+18/2=26/2=13.

5. 0.7%