9x+y=43
4x+2y=16 using the substitution method

Isolate y for substitution, and we have y=43-9x.

Substitute y in the next equation, and we have
4x+2(43-9x)=16, which leads to
4x+86-18x=16,
-14x=-70
x=5

Plug x into an equation, now that we have found the value.
9(5)+y=43
45+y=43
y=-2

Now double check our

9(5)+(-2)=?
45+(-2)=43

4(5)+2(-2)=?
20+(-4)=16

So, x=5 and y=-2.

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.