Alejandro was asked to solve a system of linear equations by using the substitution method. What is the error in his work below? Step 1: 4y+x=15 -9x + 5y = 20 Step 2: 4y+x= 15 x = 15 - 4 Step 3: 4y + x = 15 4y + (15 - 4y) = 15 4y + 15 - +y = 15 There are infinitely many solutions to the system of linear equations Select one: © A. He substituted the expression he found in Step 2 back into the incorrect given equation. O B. He did not write both equations in slope-intercept form 6 C. His last step means that the system has no solution, not infinitely many solutions. O D. He chose the wrong given equation to solve for one of its variables in Step 2

The average hourly earnings for a construction worker is projected to be $24.50 in 2012. jason wants to join the construction work force after he graduates in 2012. his friend tells him that average hourly earnings for construction workers will rise by 2% from 2009 to 2012. based on the data below, assuming that the projected hourly earnings are correct, is jason’s friend’s statement accurate? construction industry - average hourly earnings, 2000-2009 a. his friend’s statement is accurate. the average hourly earnings will increase by 2%. b. his friend’s statement is not accurate. the percent increase will be more than 2% c. his friend’s statement is not accurate. the percent increase will be less than 2% d. his friend’s statement is not accurate. the average hourly earnings will decrease

If eh = hg and hg=16, find the diameter of k

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4