All categories

3 years ago

For the following system, use the second equation to make a substitution for y in the first equation. 2x + y = 5 y + 3 = 2x

2 answers:

7 0

For the second equation, y=2x-3. Substituting this in, you get 2x+2x-3=5. Add the 2x's (4x), and add 3 to the 5 (8). You should get 4x=8, which will give you x=2.

Alla [95]3 years ago

6 0

If y equals 2x - 3 in the second equation, than subsitute it in for y in the first.
2x + 2x - 3 = 5
4x - 3 = 5
4x = 8
x=2
2(2) + y = 5
x = 2 and y = 1

You might be interested in

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

Katarina [22]

Answer:

v > -25/p

r = -5 +7/3 w

Step-by-step explanation:

- pv + 40 < 65

Subtract 40 from each side

- pv + 40-40 < 65-40

-pv < 25

Divide each side by -p (remember to flip the inequality since we are dividing by a negative)

-pv/-p > 25/-p

v > -25/p

7w - 3r = 15

Subtract 7w from each side

7w-7w - 3r = 15-7w

-3r = 15-7w

Divide by -3

-3r/-3 = (15-7w)/-3

r = -5 +7/3 w

8 0

3 years ago

Samantha needs 9 feet of fencing to make repairs from a storm. If the hardware store sells fencing only in yards, how much

Oksi-84 [34.3K]

It's C. because 3 yards is 9 feet

6 0

2 years ago

Read 2 more answers

there are seven people and Luisa's family they have four loaves of cinnamon bread to share equally Luisa wants to know how much

makvit [3.9K]

Answer:

$\frac{4}{7}$ of a loave of bread per person

Step-by-step explanation:

Step 1: Convert words to expressions

Seven people in Luisa's Family = 7 people

Four loaves of cinnamon bread = 4 loaves

Step 2: Divide people from loaves

4 loaves / 7 people <- This means they are splitting 4 loaves of bread between 7 people

$\frac{4}{7}$ of a loave of bread per person

Answer: $\frac{4}{7}$ of a loave of bread per person

7 0

2 years ago

Why can you multiply both quantities in a ratio by the same number to find an equivalent ratio? Please help I have this for home

weqwewe [10]

Answer:

Multiplying by 1 does not change the ratio

Step-by-step explanation:

Multiplying a/b by c/c gives the equivalent ratio (ac)/(bc) because c/c is 1, the multiplicative identity element. Multiplying by 1 does not change the ratio.

6 0

3 years ago

Read 2 more answers

Not sure how to do this, how would I solve it ?

s344n2d4d5 [400]

Attached is how to do it.
The main idea of these is to figure out what “shapes” that you are either adding or subtracting.

7 0

2 years ago