1-1 Variables and Expressions (CLT)

A symbol for a number we don't know yet. It is usually a letter like x or y.

• equation

• variable

• constant

• coefficient

Numbers, symbols and operators (such as + and ×) grouped together that show the value of something.

• equation

• operation

• expression

• variable

Replace (substitute) its variable with a given number or expression.

• evaluate

• solve

• combine like terms

• distribute

A number used to multiply an unknown value.

• constant

• coefficent

• variable

• equation

Terms whose variables (and their exponents) are the same.

• like terms

• expression

• equation

• variable

Simplify the expression.

 $3x+4x-1$  

•  $6$  

•  $12x-1$  

•  $6x$  

•  $7x-1$  

 $6x+9-x+8$  

•  $22x$  

•  $15x-7$  

•  $5x+17$  

•  $6x+17$  

 $7x-3+5-4x+1$  

•  $3x+3$  

•  $11x+9$  

•  $4x+10$  

•  $9x-3$  

Three times the sum of a and b is equal to five times c.

• $3\left(a+b\right)=5c$

• $3\left(a-b\right)=5c$

• $3a+b=5c$

• $3a-b=5c$

 $3c+\left(c+4\right)=127$  

• Three times c plus the difference of c and four is 127.

• Three times c plus the sum of c and four is 127.

• Three plus c plus the sum of c and four is 127.

• Three plus the product of c and four is 127.