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Katena32 [7]
3 years ago
13

Solve x-y=5 and -3x+2y=-7

Mathematics
1 answer:
Karolina [17]3 years ago
3 0
This is the answer x=-17 aND y=-22
You might be interested in
Can i get some help on this question?
Yakvenalex [24]
Divide both sides by 8.5 to get b on its own

68/8.5 = 8
So b = 8
7 0
2 years ago
Read 2 more answers
What number is equivalent to -21
Maksim231197 [3]

Well, -21=x if x=-21 so that -21=-21 is true.

8 0
2 years ago
Read 2 more answers
At a certain time of day, a 5-foot tall man has a 4-foot shadow. If a tree is 20 feet tall, what is the length of the tree’s sha
Alecsey [184]

Answer:

16

Step-by-step explanation:

two triangles are similar so if 5ft has 4ft shadow (whis is 1/4 of 20) 20ft should have 16ft

7 0
3 years ago
Describe the pattern in the sequence find tge next three terms 13,15,17,19
natali 33 [55]

Answer:

13,15,17,19,21,23,25

Step-by-step explanation:

It goes up by 2 every term.

4 0
2 years ago
4. At the end of the school year, Rachel and Amber threw their Algebra terbooks off the top of a 12-story
defon

I'm going to decode the gibberish in the question and guess the equations are

Rachel:

h=-16t^2+36t+160

Amber:

h=-16t^2+50t+160

These equations tell us a few things not explicitly mentioned in the problem.  Namely h is in feet, t is in seconds (because of the 16) and the building is 160 feet tall.  h=0 corresponds to ground level.  I made the constants of the equations the same because they're both on the twelfth floor.  The difference between 36t and 50t reflect different vertical components of the velocity of the throw. The positive signs mean they each threw their book upwards.  Air resistance is ignored.

So we need to solve two quadratic equations and compare the t values.

0=-16t^2+36t+160

t = \dfrac{-36 \pm \sqrt{36^2 - 4(-16)(160)}}{2(-16)}

t = \dfrac{-36 \pm \sqrt{16(721)}}{-32}

t = \dfrac{9 \pm\sqrt{721}}{8}

Only the plus sign gives a positive value of t, so that's our answer for Rachel:

t_R = \dfrac{9+ \sqrt{721}}{8} \approx 4.48

For Amber we get

0=-16t^2+50t+160

t = \dfrac{-50 \pm \sqrt{50^2 - 4(-16)(160)}}{2(-16)}

t = \dfrac{-50 \pm \sqrt{4(49)(65)}}{-32}

t = \dfrac{25 \pm 7\sqrt{65}}{16}

Again we choose the plus sign,

t_A = \dfrac{25+7\sqrt{65}}{16} \approx 5.09

Rachel beat Amber by

t = t_A - t_R = 5.09-4.58 = 0.51

Answer: 0.51 seconds

6 0
3 years ago
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