Substituting the equation y = 4x + 1 into the equation 2y = -x – 1 will produce the equation ________.

Answer 1

2(4x+1) = -x -1

8x+2 = -x -1

9x = -3

x= -1/3

2y = 1/3-1= -2/3

y=-1/3

x = y = -1/3

check the answer, plug in those values into each original equation

2y=-x-1

2(-1/3) = -(-1/3) -1

-2/3 = 1/3-1= -2/3

y = 4x + 1

-1/3 = 4(-1/3) + 1 = -4/3+1 = -1/3