1. Consider the system of equations below. What could be the first step in solving by elimination? 3x + 5y = 16
3x + 2y = 10

O Add the two equations together.
O Add 5 to both sides of the first equation.
Ο Multiply the first equation by -1.
Ο Multiply the second equation by 2.

Multiple the first equation by -1

Step-by-step explanation:

After doing this you add the two equations together and follow the systems of equations as normal

Therefore y = 2

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)