We can rule out choices A and B since they have a negative slope.
We can rule out choice C because the y intercept is nowhere near 42.
The y intercept isn't clear, but if we draw a line so that it is as close as possible to all the points, then it hits around the 5 to 10 range, so 7 is a fairly good estimate. Choice D is the only answer choice left, so its the best estimate.
The last number is the y intercept and should therefore be the starting point who it should be 7 then the slope has to increase because it is going up therefore it is x so x+7
she has 17 slik roses already, and 6 friends give her 3 silk roses each, so that's 6 times 3, which makes 18, and 17 plus 18 is 35, so she has 35 silk roses in all.