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Additional resources for MTEL Mathematics 09 Teacher Certification Test Prep Study Guide (XAM MTEL, 2nd Edition)
Its slope is 0 (zero). 1. Find the slope and intercepts of 3 x + 2y = 14 . 3 x + 2y = 14 = 2y − 3 x + 14 = y − 3 2 x +7 − The slope of the line is 3 2 , the value of m. The y intercept of the line is 7. The intercepts can also be found by substituting 0 in place of the other variable in the equation. To find the y intercept: let x = 0; 3(0) + 2 y = 14 0 + 2 y = 14 2 y = 14 y=7 (0,7) is the y intercept. To find the x intercept: let y = 0; 3 x + 2(0) = 14 3 x + 0 = 14 3 x = 14 x = 14 3 ( 14 3 ,0) is the x intercept.
1. 2. 3. 4. 5 x − 1 > 14 7(2 x − 3) + 5 x = 19 − x 3 x + 42 ≥ 12 x − 12 5 − 4( x + 3) = 9 - A first degree equation has an equation of the form ax + by = c. To graph this equation, find either one point and the slope of the line or find two points. To find a point and slope, solve the equation for y. This gets the equation in slope intercept form,= y mx + b . The point (0,b) is the y -intercept and m is the line's slope. To find any 2 points, substitute any 2 numbers for x and solve for y . To find the intercepts, substitute 0 for x and then 0 for y .
Given an equation like = y 3 x − 4 , replace each letter with the other: = x 3 y − 4 . Now solve this for y : x+4= 3y 1 3x + 4 3 = y This is the inverse. Sometimes the function is named by a letter: f( x= ) 5 x + 10 Temporarily replace f( x ) with y . = y 5 x + 10 Now replace each letter with the other: = x 5 y + 10 Solve for the new y : x − 10 = 5y 1 5x −2 = y − The inverse of f( x ) is denoted as f 1( x ) , so the answer is − 1 f= (x) 1 5 X − 2 . MATHEMATICS 32 TEACHER CERTIFICATION STUDY GUIDE Functions defined by two or more formulas are piecewise functions.