How do you solve 18x + 21y=204 and 6x + 14y=82

x=9, y=2

Step-by-step explanation:

there are multiple ways to solve. I prefer lining both equations up so

18x + 21y =204

6x + 14y = 82

You can multiply 6x +14y =82 by -3 to get -18x + -42y = -246

then add both equations together to get y by itself. so you get

-21y=-42

y = 2

then substitute y back in to either equation and you'll get x=9

5x + 5

step-by-step explanation:

you should always add the diagrams and graphs we cannot see. this particular question is kind of borderline because we can make a graph for you.

(f + g)x = -x^2 +3x + 5 + x^2 + 2x

(f + g)x = 5x + 5

the graph of z = 5x + 5 is shown below. always use desmos when in doubt.

ratio is 2 : 9

the answer is three

13.5 : 3