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kogti [31]
3 years ago
8

Which of the following equations shows how substitution can be used to solve the following system of equations?

Mathematics
1 answer:
igor_vitrenko [27]3 years ago
4 0

Answer:

(3, 5)

Step-by-step explanation:

y = 2x - 1

3x + 2y = 19

In the second equation, substitute 2x - 1 in for y, since y equals 2x - 1 in the first equation. Solve for x.

3x + 2(2x - 1) = 19

3x + 4x - 2 = 19

7x - 2 = 19

7x - 2 + 2 = 19 + 2

7x = 21

7x/7 = 21/7

x = 3

Pick the first equation to solve for y since it says y =. Substitute 3 in for x.

y = 2x - 1

y = 2(3) - 1

y = 6 - 1

y = 5

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Name two different numbers that round to 30 when rounded to the nearest ten
andrew11 [14]

For this case we have the following definition:

tens place: number of two digits whose absolute value is greater than zero.

Then, we have the following rounding rule:

If the previous number is greater than or equal to five, the next number increases by one unit.

We then have the following numbers rounded to 30 when rounded to the nearest ten:

26: twenty-six

27: twenty-seven

Answer:

two different numbers that round to 30 when rounded to the nearest ten are:

26: twenty-six

27: twenty-seven

6 0
3 years ago
Read 2 more answers
What do you divide (-2/3) with to get 3/10
podryga [215]

Answer:

the equation forms like this

-2/3 divide x =3/10

Solve for  

x

by cross multiplying.

Exact Form:  

x=− 20/9

Decimal Form:

x=−2.¯2

Mixed Number Form:

x=−2  2/9

4 0
3 years ago
Another line passes through the points (-3,-5) and (1,3) find the equation of this line
Elis [28]
So slope intercept form
y=mx+b
m=slope
b=y intercept

so slope is found by
(y2-y1)/(x2-x1)
(x,y)
x1=-3
y1=-5
x2=1
y2=3


subsitute
(1-(-5))/(3-(-3))=(1+5)/(3+3)=6/6=1
slope=1
m=1
subsitute
y=1x+b
subsitute one of the points to find b
x=1
y=3
3=1(1)+b
3=1+b
subtract 1
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the equatino is
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6 0
4 years ago
Solve the following equation and show all work.
12345 [234]
3(2x + 8) = 14x - 4(2x - 6)

In the first equation, multiply everything in the parenthesis by 3.
In the second equation, multiply everything in the parenthesis by -4.

6x + 24 = 14x - 8x + 26

Combine like terms.

6x + 24 = 6x + 26

Subtract 24 from both sides.

6x = 6x + 2

Subtract 6x from both sides.

0 = 2

This means that there are no solutions.

Hope this helps!
6 0
3 years ago
Read 2 more answers
Álgebra 2 need help
lutik1710 [3]

Answer:

first term = -1/5

I cant see part b (sorry its too blurry)

thirteenth term = -0.2

part d: -19a/95a -0.2a

Step-by-step explanation:

socratic

4 0
3 years ago
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