Answer:
5 marbles are black.
Step-by-step explanation:
7-2=5
Answer:
Infinitely many solutions
Step-by-step explanation:
If we have a system of equation like:
2x+y=4
6x+3y=12
If we make y the subject in the first equation and substitute into the second equation, we get:
6x+3(4-2x)=12
We expand to get:
6x+12-6x=12
6x-6x+12=12
Now the variable adds out to give:
12=12
This statement is true so the equation has infinitely many solution.
Answer:
172.
Step-by-step explanation:
115, 165, 138, 172, 127, 193, 142
The median is the middle number, which is 172.
Uneven amount? Here’s a trick, 7 + 1 = 8 / 2 = 4, so the fourth number is the median.
3(y-2) + 2(y-2) = 5(y-2)
Both terms have the base (y-2), so they can be added together.
3 + 2 = 5
They both intercept at a single point, in a consistent system.
