निम्नलिखित समीकरणों में से प्रत्येक समीकरणों के चार हल लिखिए :
(i) ` 2x + y = 7`
(ii) ` pi x + y = 9 `
(iii) ` x = 4y `

Write four solutions for each of the following equations: (i) 2x + y = 7 (ii) pi x+y = 9 (iii) x = 4y

I. 7x + 6y = 110 II. 4x + 3y = 59 III. X + z = 15

Find the values of (x-y) , if (i) 3x + 4y = 11 , 4x + 3y = 10 (ii) 3x + 2y = 8 , 2x + 3y = 7

Solve the following systems of equations : (i) x - 2y = 0 3x + 4y = 20 (ii) x + y = 2 2x + 2y = 4 (iii) 2x - y = 4 4x - 2y = 6

Write four solutions for each of the following equations: (i) 2x+y=7 (ii) pix+y=9 (iii) x=4y

For each of the graphs given in Fig. 4.5 select the equation whose graph it is from the choices given below:(a) For Fig 4.5(i)(i) x + y = 0 (ii) y = 2x (iii) y = x (iv) y = 2x + 1 (b) For fig 4,5(ii)(i) x + y = 0 (ii) y = 2x (iii) y = 2x + 4 (iv) y = x - 4

Find the angle between the planes : (i) 3 x - 6y - 2z = 7 " " 2x + y - 2z = 5 (ii) 4 x + 8y + z = 8 " " and y + z = 4 (iii) 2 x - y + z =6 " " and x + y + 2z = 7 .

(i) x=14-y. Find x ,If y=8 . (ii) y=x-2 . Find y ,if x=7 .