The graph shows two lines, a and b. a coordinate plane is shown with two lines, a and b, graphed. line a has a slope of negative 1 and crosses the y axis at 5. line b has a slope of positive 1 and crosses the y axis at 3. how many solutions are there for the pair of equations for lines a and b? explain your answer.

There is one/unique solution to the pair of equations for line A and line B.

We know that the equation of a line in slope intercept form is given by:

                     y= mx+b

where m is the slope of the line and b is the y-intercept of the line.

The graph A:

  Line A has a slope of negative 1 and crosses the y axis at 5.

i.e. the slope of line i.e. m= -1

and y-intercept of line i.e. b=5

Hence, the equation of line A is:

              y= -x+5

Graph B:

Line B has a slope of positive 1 and crosses the y axis at 3.

i.e.  m=1

and b=3

Hence, the equation of line B is:

               y=x+3

Now from the graph of these two lines we see that the system of lines intersect at just one point.

       Hence, there is just one solution for the pair of equations.

based on context clues you gave i'm assuming the answer would be c.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value