.Solve the system of equations. Use elimination

Mathematics

1 answer:

Elina [12.6K]3 years ago

6 0

Answer:

a) (-9,3)

Step-by-step explanation:

x + 2y = -3

- (x - y = -12)

x + 2y = -3

- x + y = 12

3y = 9

y = 3

x - y = -12

x- 3 = -12

x= - 9

(-9, 3)

You might be interested in

Can the sine rule relationship in trigonometry be used with non right angled triangle?

vaieri [72.5K]

Answer:

Yes

Step-by-step explanation:

The sine rule works on all triangles (not just right-angled triangles) where a side and it's opposit angles are known.

4 0

2 years ago

If you reflect any shape across the x-axis and then across the y-axis, do you get the same result that you would if you rotated

Anton [14]

Yes, it has the same result

look at the picture. the red triangle is the first image. the green one is the result of reflecting over x-axis. then if you reflect it over y-axis, it would be the purple triangle

if you had rotated the red triangle at first, it would have the same result

good luck

8 0

3 years ago

The value of a boat, in dollars, x years after its purchase is represented by the function.

DIA [1.3K]

The average decrease in value can be solve by first solving the value at year 1 and year 2
and i think the equation is f(x)=10,000(0.73)^x

at x = 1

f(x) = 10,000(0.73)^x
f(1) = 10,000(0.73)^(1)
f(1) = 7300

at x = 2
f(x) = 10,000(0.73)^x
f(2) = 10,000(0.73)^(2)
f(2) = 5329

so the average decrease = ( 7300 - 5329) = $ 1971 per year

8 0

3 years ago

Differentiate with respect to x: log(cosx +sinx)

vampirchik [111]

I don’t understand this brother plzz explain it better

6 0

3 years ago

Your lunch bill is $19.75. A 5% sales tax will be added, and you want to give a tip of about 20% of $19.75. Estimate how much yo

nalin [4]

The estimated price you will pay for lunch is $24.69.

3 0

3 years ago

Read 2 more answers