What is Slope-Intercept Form?

m = slopeb = y-intercept

(x, y) = solution for equation

y = mx + b

Graph the equation.

432

xy

x

y

Section 8.9

Systems of Equations

Solve the system of equations by graphing.

x

y

821

xy

22 xy

Solve the system of equations by graphing.

x

y

532

xy

5xy

Solve the system of equations by graphing.

x

y

Solve the system of equations by graphing.

x

y

When might it be difficult to get an accurate answer by graphing the

system of equations?

If you go to the gas station and buy a pop and your total rings up to $1.00,

which would the clerk accept?

or

Substitution Method

=

Solve the system of equations by substitution.

Graph to see if the solution is true.

x

y

Solve the system of equations by substitution.

Solve the system of equations by substitution.

931

yxxy

Homework

417 9 – 26 all