SAT Mathematics Practice Test 5

From the graph, the y-intercept of line l is (0, 1). The line also passes through the point (1,2). Therefore the slope of the line is

2−1

1−0

=

1

1

=1,and in slope-intercept form, the equation for line l is y=x+1
Choice A is incorrect. It is the equation of the vertical line that passes through the point (1,0).Choice B is incorrect. It is the equation of the horizontal line that passes through the point (0,1). Choice C is incorrect. The line defined by this equation has y-intercept (0,0), whereas line has y-intercept (0,1).