1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vladimir1956 [14]
2 years ago
7

Solve this system of equations using any method. 2x – y = 5 4x + y =7

Mathematics
1 answer:
Natalija [7]2 years ago
8 0
Substitute on equation 2, y = -4x + 7. so equation 1 becomes 2x - (-4x + 7) = 6x - 7 = 5. 6x = 12, so x = 2. from above, y = -4x+7 = -4(2) + 7 = -1
You might be interested in
Renee is simplifying the expression (7) (StartFraction 13 over 29 EndFraction) (StartFraction 1 over 7 EndFraction). She recogni
dsp73

Answer:

The correct option is commutative property.

Step-by-step explanation:

The expression that Renee is simplifying is:

(7)\cdot(\frac{13}{29})\cdot(\frac{1}{7})

It is provided that, Renee recognizes that 7 and \frac{1}{7} are reciprocals, so she would like to find their product before she multiplies by \frac{13}{29}.

The associative property of multiplication states that:

a\times b\times c=(a\times b)\times c=a\times (b\times c)

The commutative property of multiplication states that:

a\times b\times c=a\times c\times b=c\times a\times b

The distributive property of multiplication states that:

a\cdot (b+c)=a\cdot b+a\cdot c

The identity property of multiplication states that:

a\times 1=a\\b\times 1=b

So, Renee should use the commutative property of multiplication to find the product of 7 and \frac{1}{7},

(7)\cdot(\frac{13}{29})\cdot(\frac{1}{7})=(7\times\frac{1}{7})\times\frac{13}{29}=\frac{13}{29}

Thus, the correct option is commutative property.

5 0
3 years ago
Read 2 more answers
How much interest will Hannah
baherus [9]

keeping in mind that a year has 12 months, thus 6 months is really 6/12 of a year.

~~~~~~ \textit{Simple Interest Earned} \\\\ I = Prt\qquad \begin{cases} I=\textit{interest earned}\\ P=\textit{original amount deposited}\dotfill & \$630\\ r=rate\to 6.5\%\to \frac{6.5}{100}\dotfill &0.065\\ t=years\to \frac{6}{12}\dotfill &\frac{1}{2} \end{cases} \\\\\\ I = (630)(0.065)(\frac{1}{2}) \implies I\approx 20.48

6 0
2 years ago
which cost more. 8 printers priced at $145 per printer or 3 laptop computer priced at $439 per computer? explain.
Elodia [21]
8 printers for $145 each is a total of $1160.

3 laptops for $439 is a total of $1317.

Therefore, the price of 3 laptops for $439 each cost more than 8 printers for $145 each.
8 0
3 years ago
Read 2 more answers
What is the equivalent to 16 to the 3/4 root
pshichka [43]
<span>√<span><span>​<span>2x−5</span></span>​<span>​​</span></span></span>=<span>7             3/4 
 rate if that help </span>
8 0
3 years ago
Distance between (-7,-6) and (-2,-16)
Archy [21]

Exact form:

2\sqrt\ 13

Decimal form:

7.21110255 or 7.21

5 0
2 years ago
Read 2 more answers
Other questions:
  • What is the finance charge on $13,300 financed at 7.9 percent for 4 years if the monthly payment per $100 is $2.44?
    8·1 answer
  • CJ will use 3 bags of cement for his project. Each bag of cement needs gallons of water added to it.
    15·1 answer
  • UPDATE: NEED HELP! DUE TONIGHT! THANK YOU!
    7·1 answer
  • Anybody please help me with this
    10·2 answers
  • In a study of 225 adults, the mean heart rate was 72 beats per minute. Assume the population of heart rates is known to be appro
    14·2 answers
  • What is the solution (ordered pair) for the graph ?
    13·1 answer
  • Four lines that are parallel because I am doing a math project taint glass
    8·1 answer
  • Lucia is making a 21.6 centimeter beaded string to hang in the window. She decides to put a green bead every 0.4 centimeters and
    12·1 answer
  • What fractions are equal to 2
    13·1 answer
  • If f(x) = 2x2 – 2, what is<br> X, what is f(-6)<br> give the right answer for a brilliant!
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!