Answer:
x=7,y=4.5
Step-by-step explanation:
ok so first you do 4x-y=11,6x-2y=13
then you have to eliminate something
so the easiest one is to multiply the y by -2
the reason why you have to multiply by -2 is because positive cancels out a negative
when you do that you get
x=7
then you plug in the x into one of the equations. the end was that y=9/2 or
y=4.5
1) 1 digito -----> puede ser 7 numeros
2 digito ----->puede ser 7 numeros
9 digito ----->puede ser 9 numeros
el resto tienen 10 numeros cada digito
numeros diferentes=7*7*9*10*10*10*10*10*10*10=4410000000 (cuatro mil cuatrocientos diez millones) numeros diferentes
2) perro------------->3
gato---------------> 6
oso----------------> 2
<span>a) Seleccionar un perro, un gato y un oso.----------> 3*6*2=36 maneras
</span><span>b) Seleccionar un perro o un gato o un oso.--------> 3+6+2=11 maneras</span>
Answer: 25 units.
Step-by-step explanation:
Given: B is the midpoint of line segment AC.
If 
and 
, then we have
Multiply 2 on both sides, we get
Now, AC = 5(6)+20 =30+20=50 units
Then, BC= 
Hence, the length of BC is 25 units.
Answer:
A) 15 Students
B) 35 Students
C) 1/5 or 20%
D) 9/25 or 36%
I might be wrong. Please let me know if I got something wrong.
3x-y=7
9x-3y=21
9x-3y=21
Put the equation into slope intercept form so that you can later substitute it into 3x-y=7.
9x-3y=21
-9x. -9x
-3y=-9x+21
Divide each number by -3.
You get y=3x-7
You will substitute y for 3x-7 in 3x-y=7
Solve:
3x-(3x-7)=7
3x-3x+7=7
0+7=7
7=7
This means that both equations are the same.
