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salantis [7]
3 years ago
5

7x - 3y = 31 7x + y = -1 Please solve x and y

Mathematics
1 answer:
Vika [28.1K]3 years ago
4 0

Answer:

(1, -8)

y= -8

x= 1

Step-by-step explanation:

7x-3y= 31

7x+y= -1

solve the equation

7x-3y=31

7x= -1-y

substitute the value of 7x into an equation

-1-y-3y=31

subtract -y to -3y

-1-4y=31

add both sides by 1

-4y=32

divide both sides by -4

y= -8

substitute the value of y into an equation

7x= -1-(-8)

distribute

7x=7

divide both sides by 7

x=1

(1, -8)

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Reynaldo rode his bike 2 miles north and 3 miles east. Which equation should he use to find the distance, d, that takes him dire
kotykmax [81]

Answer:

The first one, 2 square+ 3 squared= <em>d </em>squared

Step-by-step explanation:

The theory for finding the hypotenuse of a triangle is:

a^{2} + b^{2} = c^{2}\\or\\(2)^{2}+(3)^{2}=d^{2}

7 0
3 years ago
On your own paper graph each system of equations and then describe it: y=x+4 3x+5y=10
ki77a [65]
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4 0
3 years ago
A local pizza shop has a membership program for frequent buyers. The membership costs $5 per month and members get a discounted
Len [333]

Answer: Nazim have to pay $35 for 20 slices of pizza.

Monthly cost for x slices =  5+1.5x

Step-by-step explanation:

Let x = number of slices

As per given,

Total monthly cost for x slices = (membership cost) +(discounted price) ×(x)

i.e. Total monthly cost for x slices = 5+1.5x

If x=20

Then, Nazim have to pay = 5+1.5(20)

= 5+30= $35

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5 0
3 years ago
Pls helppp me this is very very urgent
Nat2105 [25]

Answer:

1. 5040

2. 20

Step-by-step explanation:

1. using the formula for permutation

nPr=n!/(n-r)!

10P4 = 10!/(10-4)!

=10*9*8*7*6!/6!

then we are left with

=10*9*8*7

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2.using the formula for combination

nCr=n!/(n-r)!r!

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=6*5*4*3!/3!3!

=6*5*4/3*2*1

=20

4 0
3 years ago
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