Question

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Answer 1

Solve for y for each of the x values of -3, and 4.
Then solve for the change that y made with those two values of x.
then divide the cange of y by the change in x, note that x went from a -3 to a + 4 or a change of 7.

Answer 2

\[y _{1}=2(-3) + 2 = -6 + 2 = 4\]\[y _{2}=2(4)+2=8+2=10\]Now you can calculate the change in y

Answer 3

Solve by calculating the change of y divided by change of x\[\Delta y \over \Delta x\]

Answer 4

6/7 ?

Answer 5

Small miscalculation on y1:\[y _{1}=2(-3) + 2 = -6 + 2 = \color{orangered}{-}4\]

Answer 6

Thanks @zepdrix, just goes show that you must also check the work of the helper......I messed up with signs.