CPM Homework Help : INT3 Problem 1-37

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1-37.

On many graphing calculators, equations must be entered in $y=$ form. Rewrite each equation in $y=$ form. Then use the Desmos tool to confirm that your equations are correct.

$x = 3y + 6$
Hint (a):
Subtract $6$ from both sides.How can you get $y$ by itself?
Answer (a):
$y=\frac{1}{3}x-2$

$x = 5y - 10$
Hint (b):
See part (a).

$x = y^2$
Hint (c):
Notice that $y$ is squared.
How many answers should you expect?
Answer (c):
$y=\sqrt{x}\text{ or }-\sqrt{x}$

$x = 2y^2 - 4$
Step 1 (d):
$2y^2=x+4$
Step 2 (d):
$y^2=\frac{1}{2}x+2$
Hint (d):
How many answers should you expect? How can you write a compact solution to show them?
Answer (d):
$y=\pm\sqrt{\frac{1}{2}x+2}$

$x = (y - 5)^2$
Hint (e):
How do you undo squaring? Continue to solve for $y$ as you did in parts (c) and (d).

Rewrite each equation and enter it in the eTool below. Check your answers using the eTool.
Click the link at right for the full version of the eTool: Int3 1-37 HW eTool