MATHEMATICS MIDDLE SCHOOL

Solve each system of linear equations by substitution you will get an x, y point for solutionshow steps
y = x - 4 2x + y = 5


next set is
x + 4y = 6 y = -x + 3


next set is
x + 2y = 6 x - y = 3

next set is
3x - 2y = 9 y = 2x - 7

Answers

Answer 1
Answer:

{y = x - 4    

                          => 2x+x-4=5 => 3x=9......x=3

{2x + y = 5                                                 y=3-4=-1

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{x+4y=6

{y=-x+3

=> x+4(-x+3)=6

   x-4x+12=6

-3x=-6

x=2

y=-2+3=1

y=1

___________________________________________________-

{x+2y=9

{x-y=3 .......x=3+y


3+y+2y=9

3y=6

y=2

x=3+2=5

x=5

_________________________________

{3x-2y=9

{y=2x-7

3x-2(2x-7)=9

3x-4x+14=9

-x=-5

x=5

y=2*5-7=10-7=3

y=3

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-4x+3y=-2

y=x-1

y=? x=?​

Answers

Answer:

x=-1 , y=-2

Step-by-step explanation:

Replace y in the first equation with x-1.

So, we have -4x+3(x-1)=-2

Multiply brackets with 3: -4x+3x-3=-2

-4x+3x=-2+3 (-3 becomes +3 after it changes sides)

-x=1 /*(-1)

x=-1

After we have x we include it in y=x-1

y=-1-1

y=-2

Whch faction is smaller 5/6 or 5/8

Answers

5/8 is the smaller fraction
5/6 is 1/6 away from 1
while 5/8 is 3/8 away from 1
Next, 3/8>2/8 
(2/8=1/4)

So, 5/8 is more than 1/4 away from 1
Because 1/4>1/6
--> 5/8 is farther away from 1 than 1/6
Thus, 5/8 is smaller.

A shortcut I've been taught is attached

Explanation of attached file: 
40 is above 5/6 
while 30 is above 5/8
since 40>30 --> 5/6>5/8

Hope this helps!

Flat side of a solid figure

Answers

Base ..............................

Which graph represents the function f (x) =[z-1]-3​

Answers

Answer:

(0,4),(1,5)

(0,0),(1,1)

Step-by-step explanation:

How can i Multiply. ×2/7*3/5

Answers

2/7 times 2 by 5 and times 7 by 5 also then that would equal 10/35
then you times 3 by 7 and times 5 by 7 to get 21/35 then add 10 and 21 to get 31 then it will be 31/35 then try to reduce it but u cant so the answer is 31/35
you first line them up and you wanna find the lcd and then remember what you do to the bottom you do to the top so

What is the exact circumference of a circle with a radius of 15 cm? Answers: A. 60cm B. 30cm C. 15cm D. 10cm

Answers

r=15cm\n\ncircumference:2\pi r\n\n2\pi r=2\pi\cdot15cm=30\pi cm
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