Question

Precal Help!

Solve algebraically.

Y+2x=7
Y=5-x

Answer 1

the second equation is already solved for y, so substitute it into the first and you get
\[5-x+2x=7\]
solve for x, then go back to the 2nd equation to solve for y

Answer 2

X=2

Answer 3

right, now put the 2 into the second equation for x and solve for y

Answer 4

5-2+2(2)=7 like this?

Answer 5

not quite. You want to use the original equations for this part.

If you use the first one.
y + 2x = 7
Now sub the 2 for x
y + 2(2) = 7
Solve for y

If you use the second.
y = 5 - x
sub the 2 for x
y = 5 - 2

You get the same value for y with either equation

Answer 6

So the solutions would be (2,3)?

Answer 7

yes

Answer 8

Okay, thank you so much!