part of 7.1 and a review of ch. 3.

ch.7:

linear equations are straight lines.

y=x+2

x+y=4

first write the equation in slope intercept form;

y=x+2
y=-x+4

use the y intercept and the slope to graph each line. The graph of the system.

y intercept slope formula;

y=mx+b

y=1x+2
y=

review of ch. 3; graphing lines in the coordinate planes;

1. ordered pairs:

the equation y=2x-1 is an equation in 2 variables. This equation is satisfied if we choose a value for x and a value for y that make it true. If we choose x=2 and y=3; then y=2x-1 becomes;

3=2(2)-1
3=3

Because 3=3 is a true statement; then the pair of numbers of 2,3 satisfies the equation or is the solution to the equation. Both sides are =.

ex. 1. pg. 172.

y=3x+4

a. let x be 2.

y=-3.2+4
=-6+4
=-2

the ordered pair 2 and -2 satisfies the equation.

b. ( ,-5)
the y coordinate of( ,.5) is -5 in the equation ;
let y=-5 in the equation y=-3x+4
-5=-3X+4
take a - 4 from both sides of the = sign.
-9=-3x
divide the 3 into the 9 for;
3=x
the ordered pair of (3,-5) satisfies the equation.

c. (O, ), replace x by 0 in the equation y=-3x+4
y=-3.0+4 =4
(0,4) satisfies the equation.

that is all for now.

soon to have a bachelor's degree in psychology with a rehabilation concentration.