3 years ago

PLEASE HELP I JUST NEED TO KNOW HOW TO DO IT

Mathematics

2 answers:

RoseWind [281]3 years ago

7 0

Your answer should be x=7 and y=7

Brilliant_brown [7]3 years ago

5 0

Answer:

y=7, x=7

Step-by-step explanation:

They both equal y, so you can set the right part of the equations equal to each other

4x-21=2x-7

solve for x

2x-21=-7

2x=14

x=7

knowing x, we can now substitute back into one of the original equations to find y

y=4(7)-21=28-21=7

y=2(7)-7=14-7=7

You might be interested in

Bucket with 20 chips. The chips in the bucket

vesna_86 [32]

Answer:

8 blue chips and 12 red

Step-by-step explanation:

8 0

2 years ago

The diameter of a sphere is 16 cm. What is the sphere's volume? Round to the nearest tenth.

ohaa [14]

Answer:

V ≈ 2144.70 $cm^3$

Step-by-step explanation:

Radius is going to be used instead of the diameter. Half of 16 is 8, and so that will be the value that shall be used.

$V = (4/3)\pi (8)^3$

V ≈ 2144.66 $cm^3$

V ≈ 2144.70 $cm^3$

5 0

3 years ago

Solve the linear expression 5(-3.4k-7)+(3k+21)

Marysya12 [62]

I am just a middle-schooler, but like to answer, so I believe k is -1.

4 0

3 years ago

Find x. Please help!!!

solong [7]

Answer:

Step-by-step explanation:

In this type of problem, x is always the average of the two angle measures of the arcs. In this case, (100+70)/2=85 degrees. Hope this helps!

5 0

3 years ago

Read 2 more answers

Sin³xcosx+sinxcos³x=sinxcosx

Svetllana [295]

Answer:

Step-by-step explanation:

$sin^3xcosx+sinxcos^3x\\=sinx cosx(sin^2x+cos^2x)\\=sinx ~cosx(1)\\=sin~x~cos~x$

6 0

2 years ago