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1- a) y= -4/5

2- a) x=7

b) y= 8

1) Simplify

You combine the like terms.

a) 7y + 3y + 8

The like terms here are 7y and 3y. So add 7+3 and you get 10:

10y + 8

b) 7x+3y-2x-10y

The like terms here are 7x + -2x, and 3y + -10y. Add them and you'll get:

5x - 7y

c) 3x^2 + 7x - 9x

The like terms here are 7x and -9x.  3x^2 has an exponent so it's not included. So add the like terms and you get:

3x^2 - 2x

2) Solve

Here you need to isolate the variables.

a) 4x + 1 = 29

The first step is to subtract 1 on both sides.

4x = 28

Then divide both sides by 4.

x = 7

b) 7y - 11 = 2y + 29

Add 11 on both sides.

7y = 2y + 40

Then subtract 2y.

5y = 40

Finally, divide both sides by 5.

y = 8

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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