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Novosadov [1.4K]
3 years ago
12

7x+3y=8 6x-3y=5 what is the value of x-y? PLEASE HELP & FAST!

Mathematics
1 answer:
Brut [27]3 years ago
3 0
X=7
y= -9

hope this helps 
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4 coffees and 12 lattes. Costs $61
Gala2k [10]

Answer:

Cost of a coffee is <u>$2.5</u> and cost of a latte is <u>$4.25.</u>

Step-by-step explanation:

Let cost of 1 coffee be 'c' and cost of 1 latte be 'l' dollars.

Given:

4 coffees and 12 lattes cost $61.

12 coffees and 7 lattes cost $59.75.

∵ 1 coffee cost = c

∴ 4 coffees cost = 4c and 12 coffee cost = 12c

∵ 1 latte cost = l

∴ 12 lattes cost = 12l and 7 lattes cost = 7l

Now, as per question:

4c+12l=61-----1\\12c+7l=59.75----2

Now, multiplying equation (1) by -3 and adding the result to equation (2). This gives,

-3(4c+12l)=-3(61)\\\\-12c-36l=-183\\12c+7l=59.75\\+\\----------\\0-29l=-123.25\\\\l=\frac{-123.25}{-29}=\$4.25

Now, plug in the value of 'l' in equation 1 to solve for 'c'. This gives,

4c+12(4.25)=61\\\\4c+51=61\\\\4c=61-51\\\\4c=10\\\\c=\frac{10}{4}=\$2.5

Therefore, cost of a coffee is $2.5 and cost of a latte is $4.25.

4 0
3 years ago
HELP ON TIMER!!!
Law Incorporation [45]
I’d say the second one, the fourth one and the fifth one.

Hope it works :)
4 0
3 years ago
What are the solutions to the following equation?
gregori [183]

Answer: -8.5

Step-by-step explanation:

I got it right on edg

3 0
3 years ago
Read 2 more answers
If you know that 7 - square root 5 is it root of a polynomial function
Kitty [74]

Answer:

As you must know, If one root of the polynomial 7-√5, the other will be 7+√5 i.e irrational root occur in pairs.

A polynomial function cannot have single unreal i.e irrational root. It always occur in pairs.

So , consider a polynomial function of any degree, if it has a root 7-√5, then it must have another root as 7+√5.

A polynomial can't have 7-√5 as a single root.  




4 0
3 years ago
X &lt; -4.8
Kamila [148]

Answer:

D & E

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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