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Colt1911 [192]
3 years ago
12

If 2x +y=-7 and 3x=6+4y are simultaneous equation, what is the value of x-y​

Mathematics
1 answer:
Aleks04 [339]3 years ago
7 0
Multiply by 48x+4y=28 3x-4y=6
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IDK WHAT TO DO SOMEONE PLEASE EXPLAIN OR HELP
Zarrin [17]
Alright so, let’s break this down.

To find the first coordinate you need to solve the first equation

To do that you can do
6+9=15
So that mean 3x has to be equal to 15
You divide 15 by 3

The answer to that is the solution to the first equation, or the first coordinate.

For the second one, you know x has to be negative because the solution is negative

2x is going to have to equal -20
-20/2 gets you the solution

Remember that it will be negative
You now have both of the coordinates

You take coordinate A and technically add coordinate B to it
You do that because B is negative and A is positive
Then you have the answer to c
6 0
3 years ago
Joaquin receives $0.40 per pound for 1-99 pounds of aluminum cans. He receives $0.50 per pound if he recycles more than 100 poun
yuradex [85]

YES  
f(x)=0 when x is from (-infinity to 1) 
f(x)=0.40x when x is from [1 to 99] 
f(x)=0.50x when x is from (99 to +infinity)  
Here f(x) is what Joaquin earns which is dependent on the weight (represented by x), thus the amount of money he receives is a function of weight.
7 0
4 years ago
PLZ HELP I BEGGG 20 POINTS!!!!!!!
Roman55 [17]

Answer:

i belive its 100

Step-by-step explanation:

5 0
3 years ago
Ben earns $750 a month plus 4% commission on all his sales over $900. Find the minimum sales that will allow Ben to earn at leas
e-lub [12.9K]
$750 + s x 4% = $2,500 | - $750

s x 4% = $1,750 | : 4%

s = $43.750
4 0
3 years ago
X+y+z=2<br> -x+3y+2z=8<br> 4x+y=4
olga nikolaevna [1]

Answer:

So what do you need help in plz

6 0
4 years ago
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