Find a is XZ=19,Xy=a+4 and YZ=a-7.

a = 11

Step-by-step explanation:

XY + YZ = XZ = 19

(a + 4) + (a - 7) = 19

2a - 3 = 19

2a = 22

a = 11

1e+27

step-by-step explanation:

options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.