Go Math 8.1: Solutions of Equations

Does 19 = 29

x - 0.7 = 4.3 for x = 3.6

That means plug in 3.6 for x

What do you get?

Since we get 2.9 = 4.3

and 2.9 does not equal 4.3

The 3.6 we plugged in ______ a solution.

m + 2.5 = 4.6; m = 2.9

When I plug in 2.9 for m, I get:

When we plug in 2.9 for m in the equation m + 2.5 = 4.6

we get 5.4 = 4.6

Since 5.4 does not equal 4.6, we say that plugging in 2.9 for m ____ a solution to the equation.

d - 8.7 = 6; d = 14.7

Plug in 14.7 for d

That looks like 14.7 - 8.7 = 6

When I find 14.7 - 8.7, I get:

So d = 14.7 _____ a solution for d - 8.7 = 6

17.9 + v = 35.8; v = 17.9

When I plug in 17.9 for v, I get

Remember, if you get the same number on both sides, the number you plugged in IS a solution.

If you get different numbers on both sides of the equals sign, the number you plugged in IS NOT a solution of the equation.

So, in the problem you just worked on, 17.9 _____ a solution.

c + 35 = 57; c = 32

When I plug in 32 for c, I get

Remember, if you get the same number on both sides, the number you plugged in IS a solution.

If you get different numbers on both sides of the equals sign, the number you plugged in IS NOT a solution of the equation.

So, in the problem you just worked on, 32 _____ a solution.

18 = (2/3)h; h = 12

When I replace h with 12, I get:

So h = 12 ______ a solution.

In the equation t + 2.5 = 7, determine whether t = 4.5, t = 5, or t = 5.5 is a solution to the equation.

The marking period is 45 school days long. Today is the twenty-first day of the marking period. The equation x + 21 = 45 can be used to find the number of days left in the marking period. Using substitution, how many days are in the marking period?