Question

Solve the simultaneous equations. 3x – 4y = 15; x + y = -2.​

Answer 1

Answer:

x = 1, y = -3

Step-by-step explanation:

3x - 4y = 15  -- i

x   +  y  = -2 -- ii

Multiplying ii with 3

3x + 3y = -6 --iii

Subracting iii from i

3x - 4y = 15

-3x - 3y = +6

= 0x - 7y = 21

=> y = -3

Substituting y in equation ii

x + (-3) = -2

x -3 = -2

x = -2 + 3

=> x = 1