OG详解-OG10 数学2 Q2

Choice A is correct. The line of best fit shown has a positive slope and intersects the y-axis at a positive y-value. The graph of an equation of the form y = mx+b, where m and b are constants, has a slope of m and intersects the y-axis at a y-value of b. Of the given choices, only y = x+3.4 represents a line that has a positive slope, 1, and intersects the y-axis at a positive y-value, 3.4.
Choice B is incorrect. This equation represents a line that intersects the y-axis at a negative y-value, not a positive y-value. Choice C is incorrect. This equation represents a line that has a negative slope, not a positive slope. Choice D is incorrect. This equation represents a line that has a negative slope, not a positive slope, and intersects the y-axis at a negative y-value, not a positive y-value.