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4 years ago

Solve for x and y. 3x+8y=20. 5x+3y=23

Mathematics

2 answers:

GrogVix [38]4 years ago

6 0

Answer:

x=4 and y=1

Step-by-step explanation:

Equation 1) 3x+8y=20

Equation 2) 5x+3y=23

Equation 1) 5(3x+8y=20 )

Equation 2) 3(5x+3y=23)

15x+40y=100

15x+9y=69

(Take away 40y from 9y and 100 from 69)

31y = 31

y=1

Substitute y=1 into equation 1)

3x+8=20

(Take away 8 from both sides)

3x=12

(Divide by 3)

x=4

Virty [35]4 years ago

4 0

Answer:

Equation 1:

x= -8/3y + 20/3

y= -3/8x + 5/2

Equation 2:

x= -3/5y + 23/5

y= -5/3x + 23/3

Step-by-step explanation:

SEE BELOW FOR STEPS

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Plz plz help me with this

Grace [21]

A) set them equal to 180° so it should be 180=5x+10 and x=34 plug it in and VRX=56° and WRV=124°

7 0

3 years ago

Subtract the cube root of the product of h and 3k from the square of the sum of p and q

ehidna [41]

Answer:

(p + q)² - ∛(h·3k) or (p + q)² - ∛(h·3k)

Step-by-step explanation:

Cube root of x: ∛x

Product of h and 3k: h·3k

Sum of p and q: p + q

*****************************

From (p + q)² subtract ∛(h·3k) This becomes, symbolically:

=> (p + q)² - ∛(h·3k)

3 0

3 years ago

at one scholl at prep level there were 5 set of twins,two sets of triplets and one set of quadruplets starting school this year.

katen-ka-za [31]

Answer: Fraction of twins = $\frac{5}{8}$ Fractions of triplets = $\frac{1}{4}$ Fractions of quadruplets = $\frac{1}{8}$

Step-by-step explanation:

Since we have given that

Number of set of twins = 5

Number of sets of triplets = 2

Number of sets of quadruplets = 1

Total number of sets is given by

$5+2+1=8$

Now, we need to find the fraction of those students.

So, Fraction of twins is given by

$\frac{5}{8}$

Fractions of triplets is given by

$\frac{2}{8}=\frac{1}{4}$

Fractions of quadruplets is given by

$\frac{1}{8}$

3 0

4 years ago

If gas prices are now $3.75 and they were up 10% from 6 months ago, how much were gas prices 6 months ago?

Hatshy [7]

Given

gas prices are now $3.75 and it up 10% from 6 months ago.

Find out how much were gas prices 6 months ago.

To proof

gas prices now = $3.75

let the gas price 6 month ago = x

gas price now is rise up 10% from 6 months ago

First write 10% in simpler form

$= \frac{10}{100}$

= 0.1

Now the equation becomes

0.1x + x = 3.75

1.1x = 3.75

$x =\frac{3.75}{1.1}$

x = 3.41 (approx)

Thus gas prices 6 months ago be $ 3.41 (approx )

Hence proved

7 0

3 years ago

My math teacher gave me this problem, what is p+7=-9

marshall27 [118]

P = -16

Subtract 7 from both sides to isolate the variable.

3 0

3 years ago