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Additional info for MTEL Middle School Mathematics Science 51 Teacher Certification, 2nd Edition (XAM MTEL)
Sample text
If the equation solves to x = any number, then the graph is a vertical line. - If the equation solves to y = any number, then the graph is a horizontal line. - When graphing a linear inequality, the line will be dotted if the inequality sign is < or > . If the inequality signs are either ≥ or ≤ , the line on the graph will be a solid line. Shade above the line when the inequality sign is ≥ or > . Shade below the line when the inequality sign is < or ≤ . Inequalities of the form x >, x ≤, x <, or x ≥ number, draw a vertical line (solid or dotted).
STEP 8. The solution of a linear equation solves to one single number. The solution of an inequality is always stated including the inequality sign. Example: Solve: 3(2 x + 5) − 4 x = 5( x + 9) 6 x + 15 − 4 x = 5 x + 45 2 x + 15 = 5 x + 45 ref. step 1 ref. step 4 − 3 x + 15 = 45 ref. step 5 − 3 x = 30 ref. step 6 x = −10 Example: Solve: ref. step 7 1 2(5 x + 34) = 1 4(3 x − 5) 5 2 x + 17= 3 4 x − 5 4 LCD of 5 2, 3 4, and 5 4 is 4. Multiply by the LCD of 4. 4(5 2 x + 17= 3 4 x − 5 4) 10 x + 68 = 3 x − 5 ref.
STEP 4. Combine like terms on each side of the equation or inequality. STEP 5. If there are variables on both sides of the equation, add or subtract one of those variable terms to move it to the other side. Combine like terms. STEP 6. If there are constants on both sides, add or subtract one of those constants to move it to the other side. Combine like terms. STEP 7. If there is a coefficient in front of the variable, divide both sides by this number. This is the answer to an equation. However, remember: MATHEMATICS/SCIENCE MS 34 TEACHER CERTIFICATION STUDY GUIDE Dividing or multiplying an inequality by a negative number will reverse the direction of the inequality sign.