today we will solve equations with two variables. solve = figure out
TRANSCRIPT
Today we will solve equations with two
variables.
Solve = figure out
Equation – Number sentence that you have to solve (balance)
using variables.5 + x = y + 7
7x – 1 = y
z = 5y - 4
Steps for Solving an Equation1. Write down your equation.
2. Plug in the given variable.
3. Solve.
4. Check
Let’s do one together
1. Write down your equation.
2. Plug in the given variable.
3. Solve.
4. Check
+ 4
If = 7, what is ?
=
= + 4
= 7 + 4
= 11
Here’s another
1. Write down your equation.
2. Plug in the given variable.
3. Solve.
4. Check
+ 4
If = 2, what is ?
=
= + 4
= 2 + 4
= 6
One More
1. Write down your equation.
2. Plug in the given variable.
3. Solve.
4. Check
+ 4
If = 14, what is ?
=
= + 4
= 14 + 4
= 14
Let’s try one with letter variables
n = x – 3.
If x = 4, what is n?
1. Write down your equation.
2. Plug in the given variable.
3. Solve.
4. Checkn = x - 3
n = 4 - 3n = 1
1 = 4 – 3 ?
1 = 1 !!!!!
Let’s try another
z = 4 + y.
If y = 2, what is z?
1. Write down your equation.
2. Plug in the given variable.
3. Solve.
4. Checkz = 4 + y
Z = 4 + 2z = 6
6 = 4 + 2 ?
6 = 6 !!!!!
Let’s try one with letter variables
2x - 1 = y.
If x = 3, what is y?
1. Write down your equation.
2. Plug in the given variable.
3. Solve.
4. Check2x - 1 = y
2 x 3 - 1 = y5 = y
2 x 3 - 1 = 5 ?
5 = 5 !!!!!
Complete the Table
x y1 32 ?3 ?
Y = 2x + 1
a.4 and 5b.4 and 6
c. 5 and 6d.5 and 7
What did you learn today?
What is a variable?
What is an equation?
Solve this equation:
a = 6b – 1. If b = 3, what is a?
a. 18
b. 19
c. 8
d. 17
Print slides 13-16 for homework
Complete the Table
x y1 423
Y = 3x + 1
Complete the Table
x y567
Y = x + 17
Complete the Table
x y368
Y = 2x + 3
Complete the Table
x y2
309
Y = 5x