Answer:
one solution
Step-by-step explanation:
x + y = 6 so 2x + 2y = 12
That means 3y = 9 so there is only one solution. x also equals 3
Answer: Infinitely many solutions
Step-by-step explanation:
If you simplify the equation 2y=14-2x and divide everything by 2 you get y=7-x or y=-x+7 which equals the second equation perfectly so there are infinitely many solutions to the system of equations
Answer:
im pretty sure its the last image.
Step-by-step explanation:
Use tI 84 calculator .
go to y= and then plug the equation in the side then you will find the answer
Answer: 0.4693877
Step-by-step explanation:
Given that:
cos x=−6/7,
From trigonometry :
Cosx + sinx = 1
Cos2x = cos(x + x)
Recall the double angle identity:
Cos2x = 2cos^2x - 1
Sin2x = 1 - 2sin^2x
Since cosx = - 6/7
Then
Cos2x = 2cos^2x - 1
Cos2x = 2cosx^2 - 1
Cos2x = 2(-6/7)^2 - 1
Cos2x = 2(36/49) - 1
Cos2x = 2 * (72/98) - 1
Cos2x = (2 * 0.7346938) - 1
Cos 2x = ( 1.4693877 - 1)
Cos2x = 0.4693877
