-3(7+5) What is the value of 22 9(2)?

Please help quickly !

Lyrx [107]

Answer:

a,c

Step-by-step explanation:

if Jen covered m miles.

$m=\frac{1}{3}(45,000)\\and ~3~(m)=45,000\\$

3 0

3 years ago

How do you do simultaneous equations ??

Pachacha [2.7K]

5x + 2y = 22
10x + 9y = 59
so now we need to either eliminate the y or the x and we need to multiply both numbers by something so that they will be the same and we can add or minus them.
so here I will eliminate x because it's easier

we multiply the top equation by 2 and the bottom equation by 1 and we get

10x + 4y = 44
10x + 9y = 59

so now we can see that the number of x's are the same and we can just find the DIFFERENCE between the two equations if it was -10x and 10x we would ADD

= 5y = 15
notice that the x'a have cancelled each other out

now we divide both sides by 5 so
y=3

now we have y, we need to substitute it into one of the original equations, doesn't matter which one. I'm going to do the first one.

5x + 2y = 22
5x + 2(3)=22
5x + 6 = 22
now minus 6 from both sides
5x = 16
divide both sides by 5
x = 3.2

we have our answers but to be sure we need to just substitute the values for x and y into BOTH original equations.

5x + 2y = 22
= 16 + 6 = 22

10x + 9y = 59
= 32 + 27 =59

Tadaa!! and there you have it
y = 3
x = 3.2

hope this helped :)

3 0

4 years ago

Read 2 more answers

Mark got 54 out of 66 correct in his test. What fraction of the marks did he get correct? Give your answer in its simplest form

elixir [45]

Answer:

$\texttt{Fraction of the marks did he get correct}=\frac{9}{11}$

Step-by-step explanation:

Mark got 54 out of 66 correct in his test.

We need to find what fraction of the marks did he get correct,

Total number of questions = 66

Total number of correct answers = 54

$\texttt{Fraction of the marks did he get correct}=\frac{\texttt{Total number of correct answers}}{\texttt{Total number of questions}}\\\\\texttt{Fraction of the marks did he get correct}=\frac{54}{66}\\\\\texttt{Fraction of the marks did he get correct}=\frac{9}{11}$

6 0

3 years ago

Graph the system of equations on graph paper.

masha68 [24]

4. The x-coordinate of the solution is 9.
5. The y-coordinate of the solution is −8 .
6.The ordered pair that is the solution to the system lies in Quadrant IV .

Proof:

Solve the following system:
{4 x + 3 y = 12 | (equation 1)
{2 x + 3 y = -6 | (equation 2)

Subtract 1/2 × (equation 1) from equation 2:
{4 x + 3 y = 12 | (equation 1)
{0 x+(3 y)/2 = -12 | (equation 2)

Multiply equation 2 by 2/3:
{4 x + 3 y = 12 | (equation 1)
{0 x+y = -8 | (equation 2)

Subtract 3 × (equation 2) from equation 1:
{4 x+0 y = 36 | (equation 1)
{0 x+y = -8 | (equation 2)

Divide equation 1 by 4:
{x+0 y = 9 | (equation 1)
{0 x+y = -8 | (equation 2)

Collect results:

Answer: {x = 9 , y = -8