What is the solution for the system of equations x+y=2 and x-y=4

Answers

Answer 1

Answer: x+y=2 (label equation one)
x-y=4 (label equation two)

y=-x+2 (equation one rearranged, label this equation equation three)

sub 3 into 2
x-(-x+2)=4
x+x-2=4
2x-2=4
2x=6
x=3
sub x=3 into equation one

3+y=2
y=-1

therefore x=3 and y=-1

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on June 1, 2013, the number of hours of daylight in Anchorage, Alaska was 18 1/4 hours. what was the number of hours without daylight?

Answers

ok if there is 24 hours in a day just do this

24-18 1/4=5.87

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Round 9.921 to the nearest hundredth

Answers

Your answer is 9.92 :))

Are these expressions equivalent 5(5c+6) and 25+30c

Answers

Answer:

Step-by-step explanation:

If you where to simplify them it would be 25c + 6 and 25 + 30c

Simplify negative 3 over 2 / 9 over 6

Answers

$\mathrm{Simplify} -\frac{3}2/\frac{9}6.$

Dividing by a fraction is the same as multiplying by its reciprocal. (flipped version)

$-\frac{3}2/\frac{9}6=-\frac{3}2*(6)/(9)$

6 and 9 are both divisible by 3, so we can simplify 6/9 = 2/3.

$-\frac{3}2*\frac{2}3$

We can multiply across right now, but we might as well cross cancel.
Look at the numbers diagonal from one another...-3 and 3 are both divisible by 3, so we can change them to -1 and 1...2 and 2 are both divisible by 2, so we can change them to 1 and 1...

$-\frac{1}1*\frac{1}1$

Any fraction over 1 can just be expressed as a whole number.

$-1*1$

Our final answer... $-\frac{3}2/\frac{9}6=\boxed{-1}$

If you were to multiply across, (maybe you don't like cross cancelling, idk?) you'd get the same answer, of course.

$-\frac{3}2*\frac{2}3=-\frac{6}6=\boxed{-1}$

Answer:

−1

Step-by-step explanation:

I took the test and got it correct

Can someone explain to me how to do this

Answers

Angles on a straight line add up to 180°, so:

x + 60 = 180

x = 180 - 60

x = 120°

60+60+60=180
180/60=30
x=30

(Due by 6:00 PM TODAY! PLEASE HELP! WILL MARK CORRECT ANSWER AS BRAINLIEST!)Find the error then make the correction and solve the equation.
(please write the whole equation to show your work)

Wrong:
4a-5=2a-3
4a-2a-5=3
2a-5=3
2a=8

HINT: a=1

Answers

Answer:

a= 4

Step-by-step explanation:

4a-5=2a-3

4a-2a-5=3

2a-5=3

2a=8

2a/2=8/2

a= 4

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