Check my answer? I needed to make these equations into y = mx + b form: 42x - 4y = 3, 21x = 2y - 3, and 21x = y + 3/2.
My answer for #1: y = - 10.5x - (3/4). For #2: y = 10.5x + 1.5, For #3: y = - 21x + 3/2.

Question

Check my answer? I needed to make these equations into y = mx + b form: 42x - 4y = 3, 21x = 2y - 3, and 21x = y + 3/2.
My answer for #1: y = - 10.5x - (3/4). For #2: y = 10.5x + 1.5, For #3: y = - 21x + 3/2.

phi · Answer

you are getting the wrong signs on answers #1  and #3

anonymous · Answer

What do you mean by signs?

phi · Answer

42x - 4y = 3

can you do this one step by step ?

anonymous · Answer

I subtract 42x from both sides and get - 4y = - 42x + 3, then I divide everything by - 4, to isolate y and get y = - 10.5x - (3/4).

phi · Answer

sounds good, except  -42x/-4  is not  -10.5x

phi · Answer

minus over minus makes a positive

anonymous · Answer

It's positive 10.5, just realized my mistake.

phi · Answer

that's what I meant by getting the wrong sign

anonymous · Answer

Okay, thanks.

phi · Answer

for the last question
 21x = y + 3/2

subtact 3/2 from both sides
21x - 3/2 =y
or
y = 21x -3/2

anonymous · Answer

Thanks