# Algebra 1 Common Core Student Edition, Grade 8-9

(Marvins-Underground-K-12) #1

Think ing Mathematically

``````Mathematical reasoning is the key to making sense of math and
solving problem s. Throughout the program you'll learn strategies to
develop mathematical reasoning habits.``````

``````Hello, I ’m Tyler.
These plan boxes will
help me f ig ure out
where to start.``````

``M«l Ac Uncut the right'Uuog Two Paint* to Writ, on equation``

How does the graph
eq uat ion?
Yo u c a n u s e t w o p o i n t s
on the line to find the
sl ope. Then use
point-slope form.

``````^CSSSSD Using Two Points to Write an Equation
W h a t is a n e q u a t i o n o f t h e l i n e a t t h e r i g h t?``````

``````You need the slope m,
so s ta rt w i t h th e s lo p e
formula.
Us e t h e g iv e n p o in ts to
find the slope.
Us e p o in t-s lo p e f o rm.``````

``````Use e ith er g iven p o in t fo r
(x], y 1). For e xam p le, you
can use (1 ,4 ).``````

• xVz 2 ~ Yi - Xj

``m =-3 - 4 .—2 — 1 zl-1— 3 3``

``y - yi = m(x - x ^``

``y - 4 = |( x - 1)``

``````The w orked-out problem s include
call-outs that reveal the strategies and
reasoning behind the solution. Look fo r
the b oxes la b e le d Pl an and Think.``````

``````The Think- W rit e probl ems model the
thinking behind each step o f a solution.``````

``````Wh*ii* 16 cMihwloK| Sotving a Two-Sfup equation al*3* 15?
Sue**!! fa*. ud*
»«*<*!< iMefcje.``````

``````15 * 15 Supty fur WfuIWI rtwti.
i j ) Got If? l,WhMl»ihc*otoitonofi- | -3»``````

• Paper per ad: • Paper for banner: 5 sheets 5 sheet

• Total paper: 18 sheets

``The num ber o f adsyou can make W rite and solve an equation. Let thevariable represent the unknown.``

``i -’M tj S.*g on.``

``````Other worked-out problems model a
problem-solving plan that includes the
steps o f stating w h a t yo u Know ,
id e n tifyin g w h a t you N e e d / a n d
developing a Plan.``````