X = Y + 5 A = B - 4 Z = 3 A C = D (circumference of a circle) A = W H (area of a rectangle with width W and height H) E = M C2 (Einstein's famous equation!)In the first equation, if Y is 2, then X must be 2 + 5 or 7 to make the equation true. In the second equation, if B is 10, then A must be 6 to make the equation true. In the third equation, the number next to the letter means multiply the value of the variable represented by "A" by 3. So if A is 4, then Z must be 12 to make the third equation true.
To learn more about solving equations, see how to solve an equation.
Now here's a problem for you:
In the first equation, if Y were 10, what would X be?