Homework Help: Pre-Algebra

Posted by mysterychicken on Tuesday, May 5, 2009 at 3:56pm.

Can someone show me how to answer these questions step-by-step? Thanks!

Solve the equation for y in terms of x

1.2x + 7= y

2. x- 2/3y= 3

3.-12x + 3y = 48

Give any three ordered pairs that are solutions of the equation

4. -1/4y - x =0

5. 5x - y= -5

-MC

Pre-Algebra - Riley, Tuesday, May 5, 2009 at 9:33pm
to solve for y in terms of y just set the equation equal to y. Then divide everything by the coefficiant of y.

#1) 2x+7=y (already correct)

#2) x-(2/3)y=3
x-3=(2/3)y (move y by itself)
(x-3)/(2/3)=y (divide by 2/3)
-->(3x-9)/2=y (simplify)
Pre-Algebra - RickP, Tuesday, May 5, 2009 at 11:52pm
-12x + 3y = 48

add 12x to both sides
3y = 12x + 48

divide all terms by 3
y = 4x + 16

------------------------------

-1/4y - x = 0

start as above: solve for y

add x to both sides
-1/4y = x

multiply all terms by -4
y = -4x

Now plug in 3 values for x (such as -1, 0, and 1) and find the value for y for each. The three resulting (x,y) pairs are ordered pairs.

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