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Salsk061 [2.6K]
2 years ago
6

Solve the system of equations by substitution. 5x + y =18 Y=4x

Mathematics
1 answer:
mixer [17]2 years ago
6 0

Answer:

x =2 y= 8

Step-by-step explanation:

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Dennis got 85 percent of the questions on the math test correct, which was out of 40. what was his actual mark?​
makkiz [27]

Answer:

34/40

Step-by-step explanation:

85/100 cross multiply x/40

100x/100=3400/100

x=3400/100

3400/100=34

x=34

Picture included

(Sorry about my handwriting)

Hope this helps!! :)

Stay safe and have a wonderful day/night!!!!!

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4 0
3 years ago
A car traveled 100 miles in 10 minutes, what was the car's average speed ?
SCORPION-xisa [38]

Answer:

10 miles per 1 minute

Step-by-step explanation:

100 miles / 10 minutes

100/10

10/1

10 miles / 1 minute

5 0
2 years ago
Read 2 more answers
3y/5 = 15 the value of y is
LenKa [72]

Step-by-step explanation:

\frac{3y}{5}  = 15 \: cross \: multiply \: you \: have \: 3y = 75 \: which \: is \: 25

4 0
3 years ago
4. Jonathan takes his dog to be groomed. The fee to groom the dog is $80 plus 6.75% tax.
frutty [35]

Step-by-step explanation:

Tax charge

80 × 6.75/100 = 5.4

Cost + tax charge

80 + 5.4 = 85.4

Tip (15% of cost and tax)

85.4 × 15/100 = 12.81

(Cost + tax charge + tip)

85.40 + 12.81 = 98.21

therefore, $95 is not enough.

3 0
3 years ago
Please help explanation if possible
egoroff_w [7]

Answer: x = 2 and y = -4

x + 2y = -6

x = -6-2y

Putting this in value of x in

6x + 2y = 4

6(-6-2y) + 2y = 4

-36-12y+2y = 4

-10y = 4+36

y = 40/(-10)

y = -4

Now putting this value of y in

x + 2y = -6

x + 2(-4) = -6

x -8 = -6

x = -6+8

x = 2

Therefore x = 2 and y = -4

If we put these values we can check this

x + 2y = -6

2 + 2(-4) = -6

2 -8 = -6

-6 = -6

please click thanks and mark brainliest if you like :)

7 0
2 years ago
Read 2 more answers
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