All categories

3 years ago

X=-4 –7x + 5y = 13 what is Y?

Mathematics

2 answers:

Ray Of Light [21]3 years ago

7 0

-7x + 5y = 13
-7(-4) + 5y = 13
28 + 5y = 13
5y = 13 - 28
5y = -15
y = -15/5
y = -3

Darina [25.2K]3 years ago

7 0

Answer:

Step-by-step explanation:

This is how you will do:

-7x(-7x-4)+5y=13

=28+5y=13

Pass 13to the other side across the mark , that will change the sign to make it negative (28-13=5y)

15=5y divide all sides by 5 to leave the answer as 3=y

You might be interested in

Calculate the area of the rectangle whose length:breath=3:2, perimeter =40cm

Mazyrski [523]

Answer:

let 3:2 be 3x& 2x

perimeter =40

2(l+b)=40

2(3x+2x)=40

5x=40/2

x=20/5=4cm

length=3x=3×x=3×4=12cm

breadth =2x=2×4=8cm

area of rectangle =l×b=12×8=96cm²

8 0

3 years ago

What is 3/250 as a decimal?

tatyana61 [14]

Hello noble user
Here is your answer
0.01
Good luck!

8 0

3 years ago

Read 2 more answers

The sum of two numbers is 250 what is the average of the two numbers

sdas [7]

Answer:

125

Step-by-step explanation:

5 0

3 years ago

One diagonal of a cube has length 12. Compute the surface area of the cube.

arlik [135]

Answer:

The surface area of the cube is $288\ units^{2}$

Step-by-step explanation:

we know that

The length of a diagonal of a cube is equal to

$D=b\sqrt{3}$

where

b is the length side of a cube

In this problem we have

$D=12\ units$

$12=b\sqrt{3}$

solve for b

$b=\frac{12}{\sqrt{3}}\ units$

Simplify

$b=4\sqrt{3}\ units$

<em>Find the surface area of the cube</em>

The surface area of the cube is equal to

$SA=6b^{2}$

substitute the value of b

$SA=6(4\sqrt{3})^{2}=288\ units^{2}$

7 0

3 years ago

Help! I can’t get this!

8_murik_8 [283]

If you haven’t tried this yet try typing the definitions into Google and it should give you the word.

6 0

3 years ago

Read 2 more answers