Answer:
Step-by-step explanation:
7-x=-2
-x=-2-7
-x=-9
x=9
Answer:
Step-by-step explanation:
I believe you have to make the -x to a positive by dividing because there is still an invisible one there, like:
-x/-1 < -6/-1
x > 6 . and switch the sign since you're dividing by a negative : )
-3(x + 4) + 15 = 6 - 4x......distribute the -3 thru the parenthesis
-3x - 12 + 15 = 6 - 4x....simplify
-3x + 3 = 6 - 4x...add 4x to both sides
-3x + 4x + 3 = 6....subtract 3 from both sides
-3x + 4x = 6 - 3....simplify
x = 3 <==
Answer:
<em>(2, - 6, 3)</em><em> </em>
Step-by-step explanation:
2x - y - 3z = 1 ⇒ y = 2x - 3z - 1 .... <em>(1)</em>
4x + 3y + 2z = - 4 .... <em>(2)</em>
- 3x + 2y + 5z = - 3 .... <em>(3)</em>
(1) ---> (2) and (3)
4x + 3(2x - 3z - 1) + 2z = - 4 ⇔ 10x - 7z = - 1 ... <em>(4)</em>
- 3x + 2(2x - 3z - 1) + 5z = - 3 ⇔ x - z = - 1 ⇒ x = z - 1 ---> (4)
10(z - 1) - 7z = - 1 ⇒ <u><em>z = 3</em></u>
<u><em>x = 2</em></u>
2(2) - y - 3(3) = 1 ⇒ <u><em>y = - 6</em></u>
<em>(2, - 6, 3)</em>
