1.

Solve by cross multiplication: 2x − 3y = 9; 4x + 9y + 2 = 0.

Answer»

Answer:

(x, y) = ( 5/2, -4/3)

Step-by-step explanation:

MULTIPLY equation (i) by 3 and add to equation (ii)

6x − 9y = 27     ... EQ (i) x 3

4x + 9y = -2      ... eq (ii)

10x = 25

⇒ x = 25/10 = 5/2

∴ y = (-2 - 4x)/ 9 = (-2 -10 )/9 = -12/9 = -4/3

(x, y) = ( 5/2, -4/3)



Discussion

No Comment Found

Related InterviewSolutions