First, multiply the first equation by 2.
That turns the first equation into:
6x - 2y = 18
That way it can easily be added to the second equation:
6x - 2y = 16
x + 2y = 5
---------------
7x = 21
==========
As you can see, the y disappeared, which was the objective of this operation.
Now the equations can be solved easily:
7x = 21
x = 3
Insert x=3 in the original equation:
3*3 - y = 8
9 - y = 8
9 = 8 + y
y = 1
So the result is:
x = 3
y = 1
Answer:
3. Y=3x+12
Explanation:
3 is used as the rate for whatever is for x
Answer:
240 cm
Step-by-step explanation:
10 • 18 = 180
18 - 6 = 12
12 • 5 = 60/2 = 30
12 • 5 = 60/2 = 30
180 + 30 + 30 = 240
Answer: C, y=-4
Step-by-step explanation:
