Question

1 Which method would you use to solve the system below? Explain your reasoning,

Answer 1

We would use the first equation to solve the second.

First, rewrite x+y=300 as x=300-y

Now we can substitute that for x in the second equation, allowing us to only have to solve for y.

300-y+3y=18

300-4y=18

-4y=-282

4y=282

Now, divide both sides by 4 to isolate x.

Y= 70.5

Now that we know the value of y, insert that in our first equation.

X=300-70.5

X=229.5