Answer:
and
Explanation:
step 1
Find the equation of the blue line
take the points
(0,-1) and (8,5) from the graph
Find the slope
The formula to calculate the slope between two points is equal to

substitute


simplify

Find the equation of the line in slope intercept form

we have

---> see the graph
substitute the given values

step 2
Find the equation of the black line
take the points
(0,9) and (3,5) from the graph
Find the slope
The formula to calculate the slope between two points is equal to

substitute


Find the equation of the line in slope intercept form

we have

---> see the graph
substitute the given values

therefore
The system of equations is
and