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nydimaria [60]
3 years ago
11

What is the solution to the system of equations? x = -4y 3x + 2y = 20

Mathematics
1 answer:
sergeinik [125]3 years ago
3 0

Answer:

(x, y) = (8, -2)

Step-by-step explanation:

Substitute:

3(-4y) + 2y = 20

-12y + 2y = 20

-10y = 20

y = -2

x = -4(-2) = 8

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The cost of a large pizza is $17, if I buy 3 pizzas I get a 25% discount. Each pizza has
aalyn [17]

Answer:

...Sorry but I dont get the problem can you please clarify the problem..

Step-by-step explanation:

8 0
3 years ago
N a​ triangle, the measure of the first angle is twicetwice the measure of the second angle. the measure of the third angle is 6
11111nata11111 [884]
2x+x+x+68=180                          
4x=112                                        
x=28

Angle 1: 56 degrees
Angle 2: 28 degrees
Angle 3: 96 degrees 

I hope that helps.

6 0
3 years ago
Martine’s town is building a volleyball court based on a scale drawing that is 40cm to 80cm and uses the scale 1cm:22.5cm write
never [62]

Answer:

y=22.5x

Step-by-step explanation:

we have that

The scale drawing is

\frac{1}{22.5}\frac{cm}{cm}

we know that

Using proportion find out the actual dimensions of the volleyball court

Let

x -----> drawing court lengths in cm

y ----> court lengths in cm

For x=40 cm

\frac{1}{22.5}\frac{cm}{cm}=\frac{40}{y}\frac{cm}{cm}\\\\y=40*22.5\\\\y=900\ cm

For x=80 cm

\frac{1}{22.5}\frac{cm}{cm}=\frac{80}{y}\frac{cm}{cm}\\\\y=80*22.5\\\\y=1,800\ cm

Find the equation for the proportional relation ship between drawing court lengths x in centimeters and court lengths in y centimeters

 A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form y/x=k or y=kx

For x=40 cm, y=900

substitute

k=y/x -----> k=900/40=22.5

The equation is

y=22.5x

5 0
3 years ago
Evaluate 10/16 ÷ 5/16
VikaD [51]

Answer:

2

Step-by-step explanation:

10/16 ÷ 5/16

0.625 ÷ 0.3125

2

8 0
3 years ago
Solving a system of linear equations using the substitution method. <br> 5x+4y=-26<br> 5-x=-6y
yan [13]
Solve for x in 2nd equation
times -1 both sides
x-5=6y
add 5
x=6y+5

sub

5(6y+5)+4y=-26
30y+25+4y=-26
34y+25=-26
minus 25 both sides
34y=-51
divide both sides by 34
y=-3/2
sub back

x=6y+5
x=6(-3/2)+5
x=-18/2+5
x=-9+5
x=-4


(-4,-3/2) is solution
5 0
3 years ago
Read 2 more answers
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