Question

can anyone help me solve 2 problems with substitution? :)

Answer 1

2 = 2y - x
23 = 5y - 4x

Answer 2

If you rearrange the first equation, you can get:
x = 2y - 2
You can then plug that into the x in the second equation.
23 = 5y - 4(2y - 2)
Then just solve that for y. After you get y, plug y back into x = 2y - 2 to get your x value. After you have both the x and y values, your done!

Answer 3

thank you! i got -12, -5

Answer 4

Good job :)

Answer 5

& i also have a last problem like that

Answer 6

if you have time:)

Answer 7

Sure, hit me.

Answer 8

The measure of one acute angle in a right triangle is four times the measure of the acute angle. Write and solve a system of equations to find the measure of the acute angles.

Answer 9

Alright, so what do you know about the total degree measure of a triangle? The degree measure of a right angle?

Answer 10

180 & 90

Answer 11

Alright, good. Total angle measure = angle 1 + angle 2 + angle 3.
180 = 90 + angle 2 + angle 3
90 = angle 2 + angle 3

So the sum of the two acute angles is 90 degrees.

Answer 12

yess:)

Answer 13

If you let x = measure of the smaller acute angle, what is the measure of the bigger acute angle?

Answer 14

that's the part i don't understand.

Answer 15

Well, the bigger acute angle is 4 times as much as the smaller one.
Small acute angle = x
Big acute angle = 4x

Answer 16

And their sum is 90 degrees, so
90 = x + 4x

Answer 17

ohh!

Answer 18

You can do the rest right? :)

Answer 19

yes thank you!! :) i wish i had your brain lol

Answer 20

Haha, thanks, don't worry, you'll get there :)

Answer 21

and one more question, but short

Answer 22

x + 3 = y
3x + 4y = 7

so that would be; 3x + 4(x + 3) = 7 ?

Answer 23

Yep, nice :)

Answer 24

thanks! :)

Answer 25

For systems, just try to find a way to substitute one equation into the other.

Answer 26

Okay! thank you:D

Answer 27

Good luck with the rest, byes. :)

Answer 28

byee:)