Solve it step by step

The interior angles of any triangle sum to 180°, so

(12x + 2) + 26x + (6x + 2) = 180

44x + 4 = 180

44x = 176

x = 176/44 = 4

step-by-step explanation:

total income = price of one ticket   *   number of tickets sold

  y                 =     4                                   x

so the equation is y=4x     with x≥0   because number of tickets sold can not be negative

thus the equation is a semi -line with an end point at

(0,0)

passing through :

x=1     y=4(1) = 4   so through (1,4)