Find the equations of the following lines
b. gradient -4 and passing through point (2, 1)
c. passing through the points (2, -1) and (4, 2)
d. passing through the points (1, -3) and (6, -5)
e. passing through the point (5, -2) and parallel to x + 5y + 15 = 0
f. passing through the point (1, 6) and parallel to x - 3y - 2 = 0
g. passing through the point (-1, -5) and perpendicular to 3x + y + 2 = 0

Acell phone company offers two plans to its subscribers. at the time new subscribers sign up, they are asked to provide some demographic information. the mean yearly income for a sample of 40 subscribers to plan a is $45,000 with a standard deviation of $9,200. for a sample of 25 subscribers to plan b, the mean income is $64,300 with a standard deviation of $7,100. at the 0.025 significance level, is it reasonable to conclude the mean income of those selecting plan b is larger? assume unequal population standard deviations. hint: for the calculations, assume the plan a as the first sample. what is the decision rule? (negative amount should be indicated by a minus sign. round your answer to 3 decimal places.) compute the value of the test statistic. (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.) what is your decision regarding h0 ? reject h0 fail to reject h0 compute the p-value. less than 0.01 between 0.01 and 0.025 between 0.025 and 0.05 between 0.05 and 0.10 greater than 0.10