What is y when x = 1?

   y = 380

Step-by-step explanation:

Pick any two points in table to find slope, let's use (4, 350) and (6, 330):

   m = (y₂ - y₁) / (x₂ - x₁)

       = (330 - 350) / (6 - 4)

       = -20 / 2

    m = -10

Pick any one point in table, let's use (4, 350) and slope m from above to find y-intercept:

  y = mx + b

  350 = -10(4) + b

  350 = -40 + b

      b = 390

Use m and b from above to form Equation of line:

  y = mx + b

  y = -10x + 390

Pick a few points from table to check equation y = -10x + 390 is valid:

  Point (4, 350)  

  350 = -10(4) + 390

  350 = -40 + 390

  350 = 350

  Point (8, 310)

  310 = -10(8) + 390

  310 = -80 + 390

  310 = 310

What is y when x = 1:

  y = -10x + 390

  y = -10(1) + 390

  y = -10 + 390

 y = 380

false

step-by-step explanation:

false.   two legs of the trapezoid would be congruent, but the other two would not.   were all the legs congruent, then we'd have a square; were the 2 shorter sides congruent and the 2 longer sides also congruent, we'd have a rectangle.