sat suite question viewer
What is an equation of the graph shown?
Explanation
Choice C is correct. An equation of a line can be written in the form , where is the slope of the line and is the y-intercept of the line. The line shown passes through the point , so . The line shown also passes through the point . The slope, , of a line passing through two points and can be calculated using the equation . For the points and , this gives , or . Substituting for and for in yields , or . Therefore, an equation of the graph shown is .
Choice A is incorrect. This is an equation of a line with a slope of , not .
Choice B is incorrect. This is an equation of a line with a slope of , not .
Choice D is incorrect. This is an equation of a line with a slope of , not .