4. Solve for v C=XV+X A (c-x)/(x)=v B B (-c-x)/(x)=v C (c+x)/(x)=v D (Cx)/(x)=v 5. Solve for b y=mx+b A y-mx=b A B (y)/(mx)=b C (ym)/(x)=b C D y+mx=b D

4. To solve for v in the equation $C=XV+X$, we need to isolate v on one side of the equation. <br /><br />Step 1: Subtract X from both sides of the equation:<br />$C-X=XV$<br /><br />Step 2: Divide both sides of the equation by X:<br />$\frac{C-X}{X}=V$<br /><br />Therefore, the correct answer is A: $\frac{C-X}{X}=V$.<br /><br />5. To solve for b in the equation $y=mx+b$, we need to isolate b on one side of the equation.<br /><br />Step 1: Subtract mx from both sides of the equation:<br />$y-mx=b$<br /><br />Therefore, the correct answer is A: $y-mx=b$.