Question

answer the 3rd ques

Answer 1

8x +5y = 9

3x +2y = 4

Answer

8x +5y = 9 ... (i)

3x +2y = 4 ... (ii)

From equation (ii), we get

x = 4-2y/3 ... (iii)

Putting this value in equation (i), we get

8(4-2y/3) + 5y = 9

32 - 16y +15y = 27

-y = -5

y = 5 ... (iv)

Putting this value in equation (ii), we get

3x + 10 = 4

x = -2

Hence, x = -2, y = 5

By cross multiplication again, we get

8x + 5y -9 = 0

3x + 2y - 4 = 0

x/-20-(-18) = y/-27-(-32) = 1/16-15

x/-2 = y/5 = 1/1

x/-2 = 1 and y/5 = 1

x = -2 and y = 5