Make "x" the subject of:

1. 7x + 3y = d
2. ax + by = c
3. y = mx + c

Since "x" is attached to other variables and or numbers, how would I solve it ? I'm aware I need to get "x" all by itself, but a bit "confuzzled" lol.

Question

Make "x" the subject of:

1. 7x + 3y = d
2. ax + by = c
3. y = mx + c

Since "x" is attached to other variables and or numbers, how would I solve it ? I'm aware I need to get "x" all by itself, but a bit "confuzzled" lol.

anonymous · Answer

$$7x+3y=d$$
$$7x=d-3y$$
$$x=\frac{d-3y}{7}$$ is the first one

anonymous · Answer

Basically you are solving for x.

anonymous · Answer

second one is similar.  just replace d by c, a by 7 and b by 3

anonymous · Answer

OHHHHHHHH !! Okay Sat I got you.

anonymous · Answer

good!.  last one is a little different 
$$y=mx+c$$
$$y-c=mx$$
$$\frac{y-c}{m}=x$$

anonymous · Answer

ok not really different

anonymous · Answer

Thank you so much ! Now this assignment should be easier. :)

anonymous · Answer

So the second one $$x = c - by \div a$$ right?

anonymous · Answer

x = (c - by) / a

anonymous · Answer

Kk, ty.