This is a system of equations, meaning you find the value of one variable and substitute it into the other equation
if y=-x^2-4x+23 we can put that into the second equation for y
This gives us 2x+(-x^2-4x+23)=15
Lets simplify this and set it equal to 0 by moving the 15 over
-x^2-2x+8=0
This gets us x=-4, 2
Lets try plugging both those back into our first equation and see what value of y we get
y=-(-4^2)-4(-4)+23; y=23
y=-(2^2)-4(2)+23; y=11
So you get two sets of solutions
(-4,23) and (2,11)
Answer:
Raul's claims are not correct
The equation of the graph is 
Step-by-step explanation:
Part a)
we know that
The fact that the data form a straight line does not imply that it is a proportional relationship. In order for it to be a proportional relationship, in addition to the fact that a straight line must be formed, it must pass through the origin.
In this problem the graph shows a proportional relationship because the data forms a straight line and passes through the origin (0,0)
therefore
The claim that the graph shows a proportional relationship because the data forms a straight line is not correct
Part B)
<u>Find the slope of the straight line</u>
Let

The formula to calculate the slope between two points is equal to
substitute the values
therefore
The claim that he reads 1.5 pages per minute is not correct
Part C)
The equation of the graph is equal to

Answer:
$0, you are already over your credit limit
Step-by-step explanation: