On a coordinate plane, a straight line crosses the y-axis at (0, 0). On a coordinate plane, a straight line crosses the y-axis at (0, negative 2). On a coordinate plane, a straight line crosses the y-axis at (0, negative 3). On a coordinate plane, a straight line crosses the y-axis at (0, 3).

On a coordinate plane, a straight line crosses the y-axis at (0, 0)

Step-by-step explanation:

Required

Which represents a proportion

For a graph to represent a proportion, the line of the graph must pass through the origin (i.e. it must pass through (0,0))

From the list of options, only option (a) passes through (0,0).

Other options (b - d) pass through points other than the origin.

Hence, (a) is correct

19.

step-by-step explanation:

you add the 9 in the tens column since it is a single digit and 9 plus zero is 9 so it is 19