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Irina-Kira [14]
2 years ago
7

25. Save the simultaneous equations 2x-y=4;x+y=5​

Mathematics
1 answer:
Gnoma [55]2 years ago
8 0

Answer:

Step-by-step explanation:

2x-y=4 ..........(1)

x+y=5 ...........(2)

<u>Add equation 1 and 2:</u>

We get:

3x=9

x=9/3

x=3

Substitute value of x in (2):

x+y=5

3+y=5

y=5-3

y=2

(3,2)

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6 0
2 years ago
Last year my family decided to put on a play It was A Great success . 200 people attended and we earned a total of 800 . If adul
nata0808 [166]

Answer:

200 adults

Step-by-step explanation:

We can set-up a system of equations to find the number of adults. We know children and adults attended. We will let c be the number of children and a be the number of adults. Since 200 people attended, then c+a=200.

We also know they made $800 and adult tickets cost $4 and child tickets cost $2. We can write 2c+4a=800.

We will solve by substituting one equation into the other. We start by solving the first equation for c. c+a=200 becomes c=200-a.

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8 0
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