Algebra Examples

$y + - 4 = 9$

Step 1

Replace all occurrences of $+$ $-$ with a single $-$ . A plus sign followed by a minus sign has the same mathematical meaning as a single minus sign because $1 \cdot - 1 = - 1$

$y - 4 = 9$

Step 2

Add $4$ to both sides of the equation.

$y = 9 + 4$

Step 3

Add $9$ and $4$ .

$y = 13$