MATHEMATICS MIDDLE SCHOOL

-4x+3y=-2

y=x-1

y=? x=?

Answers

Answer 1

Answer:

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

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What is the LCD of 2/7 and 9/10

Answers

Assuming LCD means Lowest Common Denominator
Assuming by "and" you mean adding the two

Well, you go by the multiples of 7;
7, 14, 21, 28, 35, 42, 49, 56, 63, 70
Multiples of 10;
10, 20, 30, 40, 50, 60, 70, 80, 90, 100

Straight away you can see the lowest common multiple is 70,
Now to go about adding them,
2/7 * 10 (both sides) , 20/70
9/10 * 7 (both sides) , 63/70

Then you add the two; 20/70 + 63/70 - now we can add them because they share the same denominator
20/70 + 63/70 = 83/70 = 1 whole 13/70 (simplified)

The LCD is 70

Quick tip, to find a common multiple (not necessarily the lowest) multiply the two denominators.

The least common denominator or LCD is 70 because for
10=10,20,30,40,50,60,70,80
7=7,14,21,28,35,42,49,56,63,70,77
and 70 is the least common denominator of 10 and 7 so 70 ims your answer

6a + 5a= -11 . I do not understand, please help. How do you solve this?

Answers

$6a+5a=-11\ \ \ \ |simplify\n\n11a=-11\ \ \ \ \ \ \ \ |divide\ by\ 11\n\na=-1\n\nAnswer\ is\ -1$

its really wanting to find outwhat a=

so

add the 6a and 5a =11a

11a=-11
a=-11/11
a=-1

Kylee and her two of her friends are at a museum. they find two quarters and 1 dime on the ground, if Kylee and her friends share the money equally, how much will each person get?

Answers

20 cents; 2 quarters + 1 dime= 60 cents. Since theres three people, 60/3 = 20 cents. Each friend will get 20 cents. Hope this helps!

25+25+10=60
60 divided by 3 is 20
So each person gets $0.20

There are 187 new students this year at Maple Elementary. what is 187 rounded to the nearest ten ?

Answers

187 rounded to the nearest ten would be 190

187 rounded to the nearest ten will be 109
Yes correct

Austin(me) had 21 girl friends. He lost 10 in a cat fight. How many girls does he have left?

Answers

21 - 10 = 11

I hope I helped please leave thanks

Which expression is equivalent to 12x − 8x + 3 and why?3 + 4x, because (12x − 8x) + 3 = 4x + 3 = 3 + 4x
7x, because 12x − 8x + 3 = 4x + 3 = 7x
12x − 5, because 12x − (8x − 3) = 12x − 5
x, because 12x − 8x + 3 = 12x − 11x = x