Solve problem using substitution
2x + y = 10
y = x + 1

x = 3

y = 4

Step-by-step explanation:

2x +  y = 10          (I)

     y = x + 1 (II)

Substitute y = x + 1 in equation (I)

2x + x + 1 = 10    {Combine like terms}

      3x + 1 = 10         {Subtract 1 from both sides}

             3x = 10 -1

             3x = 9 {Divide both sides by 3}

                x = 9/3

x = 3

Plugin x = 3 in equation (II)

y = 3 + 1

y = 4

the solution is 12x-6y

c

step-by-step explanation:

it would be see because your formula is f(x)=6x, so 6 times 1 is 6 and you go on and the best answer is c.