3 years ago

Need math help please

1 answer:

4 0

6x-3y=12

Step 1- move the 6x to the other side using the opposite operation (-6x)
-3y=12-6x

Step 2- divide everything by -3
y=-4+2x

Step 3- rearrange into the correct order (y-mx+b)
y=2x-4

Step A is wrong because the 12 wasn;t changed to the inverse or opposite operation (-12), while the others were changed.

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A news station in oregon recorded that the low temperature for 5 days were -3,-2,2,2, and 6.what was the average temperature for

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3 years ago

Read 2 more answers

WHAT IS X³-27 SIMPLIFIED

Eduardwww [97]

Answer:

It is (x - 3)³ - 9x(3 - x)

Step-by-step explanation:

Express 27 in terms of cubes, 27 = 3³:

$= {x}^{3} - {3}^{3}$

From trinomial expansion:

${(x - y)}^{3} = (x - y)(x - y)(x - y) \\$

open first two brackets to get a quadratic equation:

${(x - y)}^{3} = ( {x}^{2} - 2xy + {y}^{2} )(x - y)$

expand further:

${(x - y)}^{3} = {x}^{3} - y {x}^{2} - 2y {x}^{2} + 2x {y}^{2} + x {y}^{2} - {y}^{3} \\ {(x - y)}^{3} = {x}^{3} - {y}^{3} + 3x {y}^{2} - 3y {x}^{2} \\ {(x - y)}^{3} = {x}^{3} - {y}^{3} + 3xy(y - x) \\ \\ { \boxed{( {x}^{3} - {y}^{3} ) = {(x - y)}^{3} - 3xy(y - x)}}$