Answer:
.
Implied: 
.
Step-by-step explanation:
Get rid of the denominator by multiplying both sides of this equation with 
:
.
Isolate 
by moving 
to the left-hand side of the equation. That is: add 
to both sides of this equation.
.
By the symmetric property of equalities,
Answer:
No, because the x value of 1 correlates to two different y values.
Step-by-step explanation:
A function is defined by an x value having exactly one corresponding y value. In this case, the x value of 1 corresponds to both the y values of 2 and 8, therefore invalidating it as a function.
Hope this helps!
Answer:
81 girls are in the class
Step-by-step explanation:
in these kinds of questions to find the amount of girls in the class we need to first divide the given number; which in this case is 27, with the starting number; which is 3, and we get 9. Using the 9 we got from the earlier equation we will multiply the 9 by the number of girls in the class, which is also 9 and we get 81 as our answer.
Answer:
Step-by-step explanation:
The system of equations is expressed as
y=-2x+7 - - - - - - - - 1
y=5x-7 - - - - - - - - -2
We would equate equation 1 and equation 2. It becomes
- 2x + 7 = 5x - 7
We would add 2x to the left hand side and the right hand side of the equation. Also add 7 to the left hand side and the right hand side of the equation. It becomes
- 2x + 2x + 7 + 7 = 5x + 2x - 7 + 7
14 = 7x
Dividing the left hand side and the right hand side of the equation by 7, it becomes
7x/7 = 14/2
x = 2
y= -2 × 2 + 7
y = - 4 + 7
y = 3
2(2x-1) + 2(3x)=4x-2+6x = 10x - 2 & not <span>=10x-1</span>
