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3 years ago

How do I use substitution to solve a system of linear equations?

Mathematics

1 answer:

ELEN [110]3 years ago

7 0

Answer:

for example:

y=2x+4

3x+y=9

We can substitute y in the second equation with the first equation since y = 2x+4.

3x+(2x+4)=9

5x+4=9

5x=5

x=1

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( 7x + 1/2) + ( 7x - 7 and 1/2) Simplify

pishuonlain [190]

Answer:

The answer will be 7(2x - 1)

Step-by-step explanation:

1) Convert 7 and 1/2 to improper fraction. Use this rule: a b/c = ac + b/c

$7x + \frac{1}{2} + 7x - \frac{7 \times 2 + 1}{2}$

2) Simplify 7 × 2 to 14 .

$7x + \frac{1}{2} + 7x - \frac{14 + 1}{2}$

3) Simplify 14 + 1 to 15.

$7x + \frac{1}{2} + 7x - \frac{15}{2}$

4) Collect like terms.

$(7x + 7x) + ( \frac{1}{2} - \frac{15}{2} )$

5) simplify.

$14x - 7$

6) Factor out the common term 7.

$7(2x - 1)$

Therefor, the answer is 7( 2x - 1 ).

7 0

2 years ago

Karen, Susan, and Meg are all in a workout program. Susan lost three less than twice as many pounds as Karen. Meg lost seven mor

KiRa [710]

Answer:

Karen will get mad because, Susan lost so much weight than her, she will call the police, rant to the manager of the program, cuss at Susan then get banned from the program and go to jail.

Step-by-step explanation:

That's what would REALLY happen, or did you want me to answer the math problem?

4 0

3 years ago

Natalie has $20 to spend on 5 sandwiches. Can she spend $4.39 on each sandwich? Explain.

uranmaximum [27]

No she can't spend $4.39 for each sandwich because if you divide 20 by 5 your quotient will be 4.

6 0

3 years ago

Read 2 more answers

a vine called the mile-a-minute weed is known for growing at a very fast rate. it can grow up to 0.5 ft per day. how fast in inc

Delicious77 [7]

1 feet equals 12 inches
0.5 feet, therefore, is 6 inches.
but that is per day, so divide that by 24, which results in 1/4 inches per hour.

3 0

3 years ago

URGENT!!

ss7ja [257]

Answer:

A. 14.7cm

Step-by-step explanation:

In Triangle ABC

$\angle A=60^\circ\\\angle B=45^\circ\\b=12cm$

We are to determine the measure of side a.

Using Law of Sines

$\dfrac{a}{\sin A}= \dfrac{b}{\sin B}\\\dfrac{a}{\sin 60^\circ}= \dfrac{12}{\sin 45^\circ}\\\\$Cross multiply\\a*sin 45^\circ=12*\sin 60^\circ\\$Divide both sides by sin 45^\circ\\\dfrac{a*sin 45^\circ}{sin 45^\circ}= \dfrac{12*\sin 60^\circ}{\sin 45^\circ}\\\\a=14.7$ cm (to the nearest tenth of a cm)$

The correct option is A.

3 0

3 years ago

Read 2 more answers