Answered

Solve the following systems of equations by elimination:
4x – 5y = 22
x + 2y = -1

Sagot :

Mlcparra16id
4x - 5y = 22 ... [1]
x + 2y = -1 ... [2]

[1] - 4[2]
4x - 5y = 22
-4x - 8y = 4
   -13y = 26
      y = -2

So:
x + 2y = -1
x + 2(-2) = -1
x -4 = -1
x = 3