Lets try substitution5x+2y=21=5x=21-2y=x=(21-2y)/5
sub into second equation
-2(21-2y)/5+6y=-34(-42+4y)/5+6y=-34solve for yy=-64/17plug into equation and solve for x=(97/17)
Answer:
Step-by-step explanation:
You need to know:
Vertex form = 
The vertex is at
(h, k)
<u>Need to know about perfect squares </u>
<u>Need to know how to complete the square.</u>
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<u>To convert
you need to complete the square on the equation.</u>
Complete the Square
Divide -2 by 2 and then square it.


Add the one to the parentheses and subtract the one from the 5
Square
Now we have
<u>Next add</u> -5 - 1 = -6
Our quadratic is in vertex form now.
Vertex form = 
our equation =
Vertex = (1, -6)
I believe it’s x=3 i’m sorry if i wrong
Look at the picture i have attached. 8 tally marks are four lines with one crossed over plus three more separate lines
<span>two-thirds of eight is </span>8*2/3, which equals to16/3