Excerpt from The River Thames Roberto Barerra
Over the years, the river has been the source of a number of problems. In the
nineteenth century, Londoners dumped waste from their homes into the Thames. This
made the water so smelly that the House of Commons had to relocate for a time. The
pollution of the river also contributed to an outbreak of disease that killed many
people and to the disappearance of most of the river's fish. Luckily, various clean-up
efforts during the twentieth century have greatly improved the river's water quality
and allowed fish to return. Flooding is another concern. In 1928, a major flood killed
fourteen people and left many citizens homeless. Events like this lecto
the creation
of the Thames Barrier, a moveable flood barrier that helps stop floodwaters from
reaching central London
What would MOST LIKELY happen if the Thames Barrier failed?
A)
The fish population would decrease.
B)
London would be in danger of flooding.
There would not be enough drinking water.
D)
Ships would not be able to leave the docks.
Hi

include a picture of the drawing in order for me to

step-by-step explanation:

a.   we have two

lines:   y = 4-x   and  

y = 8-x^-1

given two simultaneous equations that are both to be

true, then the solution is the points where the lines cross. the intersection is

where the two equations are equal. therefore the solution that works for both

equations is when

4-x = 8-x^-1

this is where the two lines will cross and that is the

common point that satisfies both equations.

b.   4-x = 8-x^-1

  x           4-x       8-x^-1

-3           7        

8.33

-2           6         8.5

-1           5         9

  0           4        

-

  1           3        

7

  2           2        

7.5

  3           1         7.67

the table shows that none of the x values from -3 to 3 is

the solution because in no case does

4-x = 8-x^-1

to find the solution we need to rearrange the equation to

find for x:

4-x = 8-x^-1

multiply both sides with x:

4x-x^2 = 8x-1

x^2+4x-1=0

x= -4.236, 0.236

therefore there are two points that satisfies the

equation.

find y:  

x=-4.236

y = 4-x   = 4 – (-4.236)

= 8.236

y = 8-x^-1 =   .236)^-1

= 8.236

x=0.236

  y = 4-x   = 4 – (0.236) = 3.764

y = 8-x^-1 =   8-(0.236)^-1

= 3.764

thus the two lines cross at 2 points:

(-4.236, 8.236) & (0.236, 3.764)

c.   to solve

graphically the equation 4-x = 8-x^-1

we would graph both lines: y = 4-x   and   y

= 8-x^-1

the point on the graph where the lines cross is the

solution to the system of equations.

just graph the points on part b on a cartesian coordinate

system and extend the two lines.   the

solution is, as stated, the point where the two lines cross on the graph.

step-by-step explanation:

mark brainliest!

your answer is -9

step-by-step explanation: