3 years ago

Please Help Fast!!! 20 points Solve the system of equations: 25−x=−4y 3x−2y=30

Mathematics

1 answer:

gogolik [260]3 years ago

6 0

Answer:

(7, -4.5)

Step-by-step explanation:

25−x=−4y ---> x=25+4y

3x−2y=30

use x to substitute into the second equation

3 (25+4y)-2y = 30

75+12y-2y=30

75+10y=30

10y=-45

y=-4.5

3x-2(-4.5)=30

3x+9=30

3x=21

x=7

check:

25-7=-4*-4.5

18=18 (yes)

3*7-2*-4.5=30

21+9=30

30=30 (yes)

You might be interested in

Given that LM and LN are tangent to the circle and that the measure of angle MLN = 75.86, find the measure of arc MN.

siniylev [52]

we know that

The measure of the external angle is the semidifference of the arcs that it covers

∠MLN=(1/2)*(mayor arc MN-minor arc MN)

Let

x------> minor arc MN

major arc MN=360-x

substitute in the formula above

∠MLN=(1/2)*(mayor arc MN-minor arc MN)

75.86=(1/2)*(360-x-x)------> 151.72=(360-2x)------>360-151.72=2x

x=104.14°

therefore

the answer is

the measure of arc MN (minor arc) is 104.14°

7 0

3 years ago

Which is the sixth sequence: an=1/125 (5n-1)

Volgvan

1. Distribute
1/125 x 5n - 1/125
2. Simplify 1/125 x 5n to n/25
n/25 - 1/125

5 0

3 years ago

Yolanda purchased a prepaid phone card for $25 . Long distance calls cost 23 cents a minute using this card. Yolanda used her ca

Fynjy0 [20]

For 12 minutes because 23 x 12 is 2.76 and 25 minus 22.24 is 2.76

3 0

2 years ago

A car travels at 30 1/5 miles in 2/3 of an hour. What is the average speed, in miles per hour

jasenka [17]

Answer:

45.3 miles/h

Step-by-step explanation:

The answer is 45.3 miles/h

4 0

2 years ago

Read 2 more answers

Solve the equation 19 − x = 27<br> x = 8<br> x = 18<br> x = 46<br> x = -8

seraphim [82]

X = -8.
subtract 19.
-X = 8
divide by -1.
X = -8

7 0

2 years ago