Find the value of 5z-5 given that
-2z+9=3
Simplify your answer as much as possible.
No idea how to solve. Please explain and give answer.
Thank you!!!
Please help me. Math homework.?
2009-06-13 6:30 am
回答 (12)
2009-06-13 6:36 am
✔ 最佳答案
From the given equation - 2z + 9 = 3, you can find that z equals 3.
Given - 2z + 9 = 3, solve for z
Subtract 9 from both sides
- 2z = - 6
Divide both sides by - 2
z = 3
Now you can replace z with 3 in the expression
5z - 5 and evaluate it
5 ( 3 ) - 5
15 - 5
10
2009-06-13 6:34 am
solve the equation for z
-2z + 9 = 3
subtract 9 from both sides
-2z = 3 - 9
-2z = -6
divide by -2
z = -6/-2
z = +3
now substitute into expression
5z - 5
5 (3) - 5
15 - 5
10
-2z + 9 = 3
subtract 9 from both sides
-2z = 3 - 9
-2z = -6
divide by -2
z = -6/-2
z = +3
now substitute into expression
5z - 5
5 (3) - 5
15 - 5
10
2009-06-13 6:35 am
Try taking 9 off both sides of the 2nd equation
2009-06-13 6:35 am
solve for "z" in -2+9=3 first. Once you get the answer, plug in the value from -2z+9=3 to the "z" in 5z-5
2009-06-13 6:34 am
Lol, is the answer in the back of the book? My GUESS is that you would solve the -2z+9=3 first and put that result into the other statement.
2009-06-13 7:26 am
-2z + 9 = 3
-2z = = 3 - 9
z = -6/(-2)
z = 3
5z - 5
Substitute 3 for z.
= 5(3) - 5
= 15 - 5
= 10
-2z = = 3 - 9
z = -6/(-2)
z = 3
5z - 5
Substitute 3 for z.
= 5(3) - 5
= 15 - 5
= 10
2009-06-13 6:48 am
-2z+9=3
-2z=3-9=-6
z=3
5(3)-5=10
GOOD LUCK.
-2z=3-9=-6
z=3
5(3)-5=10
GOOD LUCK.
2009-06-13 6:40 am
your objective is to get z alone on a side by itself. subtract 9 from each side. this is to eliminate the +9. you must get rid of it by doing opposite of sign, it is positive so you subtract which is negative.
so -2z+9=3
-9 -9
-2z=-6
then you divide each side by negative two. this is to get rid of negative two. and that says -2 TIMES z. when they are right next to each other they are multiplication. division undos multiplication so...
-2(÷ -2) z = -6(÷ -2)
that equals z=3
FINAL ANSWER IS z=3
so -2z+9=3
-9 -9
-2z=-6
then you divide each side by negative two. this is to get rid of negative two. and that says -2 TIMES z. when they are right next to each other they are multiplication. division undos multiplication so...
-2(÷ -2) z = -6(÷ -2)
that equals z=3
FINAL ANSWER IS z=3
2009-06-13 6:39 am
z= 3, this is the procedure
-2z+9=3
-2z=3-9
-2z=-6
-2z/-2= -6/-2
z=3
-2z+9=3
-2z=3-9
-2z=-6
-2z/-2= -6/-2
z=3
2009-06-13 6:38 am
-2z+9=3
-9 -9
-2z=-6
/-2 /-2
z=3
5z-5=5*(3)-5=10
-9 -9
-2z=-6
/-2 /-2
z=3
5z-5=5*(3)-5=10
收錄日期: 2021-05-01 12:29:56
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090612223011AA3p3f8