Which of these is the best estimate of 68 x 1/7 ?

The relationship is linear.you can figure this out by noticing that the x steadily increases by values of 2 as the y value increases by values of 4. this means that the rate that they change is proportional, and stays the same, so therefore it is a linear equation.to figure out the equation: so for point slope form, which is what is pictured as the choices, the equation is: y -  = m(x -  so first, figure out the slope, which is m.the slope formula is:   so you can just put in two of the points.i'll just use -5, 9 and -7, 5so then(9 - 5) / -5 - (-7) = 4/-2 = -1/2so now we know the slope is -1/2.from here we don't have to do anything more, since only one of the choices has the slope -1/2.so your answer would be b.