Solving 2-step Equations

Presentation

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Mathematics

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8th Grade

•

Medium

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CCSS

HSA.REI.A.1, 7.EE.B.4A, HSA.CED.A.3

Standards-aligned

Rupert Cox

Used 258+ times

FREE Resource

6 Slides • 11 Questions

Solving 2-step Equations

Essential Understanding

you are solving by forming equivalent equations.
a 2-step equation involves two operations to undo
you will undo the operations in reverse order

Solving a Two-Step

2x+3=15

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Solving With Two Terms In the Numerator

When on side of an equation is a fraction with more than one term in the numerator, you can still undo division by multiplying each side by the denominator.

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Using an equation as a model

What do you know?
What do you need?
What's my plan?
Write and solve an equation.

Multiple Choice

Which equation would represent this problem the best.

The junior class is selling granola bars to raise money. They purchased 1250 granola bars and paid a delivery fee of $25. The total cost including the delivery fee, was $800. What was the cost of each granola bar?

1250g + 25 = 800

1250g = 800 - 25

800g + 25 = 12500

What properties are use to solve?

There are hidden steps that we assume are true.
For solving equations we focus on properties of equality

Multiple Choice

What property of equality would you use to solve this equation in the first step.

-8=\frac{s}{4}+3

Addition prop. of equality

Subtraction prop. of equality

Multiplicaion prop. of equality

Dividion prop. of equality

Multiple Choice

What property of equality would you use to solve this equation in the first step.

2x-9=7

Addition prop. of equality

Subtraction prop. of equality

Multiplicaion prop. of equality

Dividion prop. of equality

Multiple Choice

What property of equality would you use to solve this equation in the first step.

\frac{x-8}{3}=4

Addition prop. of equality

Subtraction prop. of equality

Multiplicaion prop. of equality

Dividion prop. of equality

Multiple Choice

What property of equality would you use to solve this equation in the first step.

-4\left(x+3\right)=-5

Addition prop. of equality

Subtraction prop. of equality

Multiplicaion prop. of equality

Dividion prop. of equality

Poll

Can you solve the equation by adding 3 before multiplying by 5?

\frac{d-3}{5}=6

Yes

Poll

Do you feel like to you are understanding this lesson?

Yes

Maybe with practice

I need help ASAP

Solving 2-step Equations

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