Question

7,8,9,10 answer with method

Answer 1

Answer:

7...3rd option is correct as only the equation in that option is of degree 2. Linear equation means an equation of degree 1

8...9a(1)+12a(1)=63

or 9a+12a=63

or 21a=63

or. a= 63/21

or. a= 3

9...option 2 is correct as the abscissa of any point on y axis will be 0 so if you solve with x=0 then you will get 3/4

10...option 3 is right. For explanation read maths class 9 NCERT book chapter 4