Joelle was asked to find the missing endpoint of a segment when given an endpoint of –6 +3i and a midpoint of –13 + i. her work is shown below.

her mistake

a. not subtracting the a and b in the original equations.

b. writing the final answer as 1+ 5i instead of 5 + i.

c. switching the endpoint and midpoint in her original equations.

d. not using –6 and 3 in one of her original equations and –13 and 1 in the other original equation.

C

Step-by-step explanation:

middle point is 20-i

C. switching the endpoint and midpoint in her original equations.

Step-by-step explanation:

One endpoint is –6 +3i

The other endpoint is a + bi (where a and b are unknown)

The midpoint is -13 + i. Its coordinates are obtained as follows:

coordinate of the midpoint = (coordinate of one endpoint + coordinate of the other endpoint)/2

For this case:

-13 = (-6 + a)/2

1 = (3 +b)/2

step-by-step explanation:

we are given a graph for system of inequalities.

in order to write the system of inequalities for the given graph, we need to find the inequality for each of the line separately.

let us find the slope of dotted line first.

taking two coordinates on the graph.

let us say (0,0) and (3,1).

let us find the slope of the line now.

slope of the dotted line would be =.

y-intercept of dotted line is y=0 only.

plugging slope m= and b=0 in slope-intercept form y=mx+b, we get

.

the line is shaded up of that dotted line.

therefore, for shading up we would take greater than inequality symbol > .

and because it's a dotted line we would take only > symbol in place of = sign in above equation of line.

therefore, inequality for dotted line would be

let us take two points (3,1) and (0,4) on the solid line.

slope of the solid line would be =.

for the solid line we have y-intercept b= 4.

plugging slope m= -1 and b=4 in slope-intercept form y=mx+b, we get

y = -1x + 4.

the line is shaded down of that solid line.

therefore, for shading down we would take less than inequality symbol < .

and because it's a solid line we would take ≤ symbol in place of = sign in above equation of line.

therefore, inequality for solid line would be