Question

HELP me & ill become your fan!

Answer 1

@Zelda

Answer 2

Question is?

Answer 3

Since you know 5x + 4y = 18 then that becomes one of your equations.
2x+y = 6 so that becomes your second equation.

A method you can use is to isolate both y's first then make them equal each other.

Answer 4

@jiji501 how to isolate them?

Answer 5

Well, here we go.

Since this is a rectangle, we know that:

6 = 2x+y and 18 = 5x+4y

Then the first equation becomes: y= -2x+6
Now we sub this into equation 2.

So we get: 18 = 5x + 4(-2x+6) = 5x + 24 -8x
Then 18 = -3x +24 becomes: -6 = -3x so x = 2.

Next put this into first equation:

6 = 2x+y so it goes to 6 = 2(2) + y = 4 +y
So we get y = 2

In the end, x = 2 and y = 2.

You're already my fan though :D How about a testimonial?

Answer 6

Bring the x over so for:
5x + 4y = 18

5x-5x+4y = 18-5x

4y = 18-5x

y = (18-5x)/4

Answer 7

@Zelda Thank you!

Answer 8

@jiji50, although that is a way, here substitution is a lot easier.

Answer 9

Haha, Substitution works but I always preferred that way.