Solve the system of linear equations by graphing. y=2x+9 y=6−x

 x = -1

y = 7

Step-by-step explanation:

to solve this system of linear equation using substitution methods

we would say that let

y=2x+9 equation 1

y=6−x equation 2

substitute equation 1 into equation2

2x + 9 = 6 - x

combine the like terms

2x + x = 6 - 9

3x = - 3

divide both sides by the coefficient of x which is 3

3x/3 = -3/3

x = -1

put the value of x = -1 into equation 1

y=2x+9 equation 1

y = 2(-1) + 9

y = -2 + 9

y = 7

the expected value of the random variable : 0, 1 and 2

step-by-step explanation: