Question

4 find the solution to each equation mentally.
a. $30 + a = 40$
b. $500 + b = 200$
c. $-1 + c = -2$
d. $d + 3,567 = 0$

Explanation:

Step1: Solve for a in \(30 + a = 40\)

To find \(a\), we subtract 30 from both sides of the equation. So, \(a = 40 - 30\).
\(a = 10\)

Step2: Solve for b in \(500 + b = 200\)

Subtract 500 from both sides. \(b = 200 - 500\).
\(b = -300\)

Step3: Solve for c in \(-1 + c = -2\)

Add 1 to both sides. \(c = -2 + 1\).
\(c = -1\)

Step4: Solve for d in \(d + 3567 = 0\)

Subtract 3567 from both sides. \(d = 0 - 3567\).
\(d = -3567\)

Answer:

a. \(a = 10\)
b. \(b = -300\)
c. \(c = -1\)
d. \(d = -3567\)