Solving two-step linear equations using addition and subtraction: ax + b = c

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Now Playing:Solve linear equations using addition and subtraction – Example 1a

Find x in the equation modelled by each diagram.
Find x in the equation modelled by algebra tiles.
Solve.
1. $7x + 9 = 21$
2. $98 - 2x = 14$
3. $- 35 = 6x + 49$
4. $- 4x - 11 = 109$
The total admission fee of an aquarium for 30 students is $240 after a group discount of $3 for each person. What is the original admission fee before the discount?

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.body-katex a { word-break: break-word; } Patterns Jump to: Notes Prerequisites Related Notes In this section, we will look at linear equation questions which involve two kinds of operations: addition and subtraction. We will deal with two-step linear equations modeled by diagrams as a start. Then, we will learn how to solve algebraic equations and related word problems. Prerequisites Understanding integer division Model and solve one-step linear equations: ax = b, x/a = b Related Solving linear equations using multiplication and division Solving two-step linear equations: ax + b = c, x/a + b = c Solving linear equations using distributive property: a(x + b) = c Solving linear equations with variables on both sides

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