28. 6x+42-20=6x
42-20=0
42-20 gives you 22
22=0
Statement is false
30. -2x-4=-2x-3-1
-2x-4=-2x-4
Statement is true because both sides are identical
32. 2x+8-5=2x+3
8-5=3
3=3
Statement is true for any value of x
34. 3x+(x+4)=18
3x+x+4=18
4x+4=18
4x=18-4
4x=14 (next divide both sides by 4)
x= 7 over 2
7/2
Answer:
ok, but what does z in the equation equal? Since its a letter it has to equal to a number
Solve simultaneously:
<span>15x-8y=52 and
6x+14y=38
</span>
Let's solve this system thru elimination by addition/subtraction:
Let's get rid of the x terms.
To do this, mult. the first eqn. by -6 and the second by 15. (This is not the only way in which we can do this!!) We get
-90x + 48y = -312
90x +210y = 570
--------------------------
Add all 3 columns together. We end up with:
258y = 258, so y = 1. You can find x by subst. 1 for y in either of the given equations.
If you'd like more help, please be specific about what you want.
Answer:
Sven used Sugar.
Step-by-step explanation:
The question gives the amount of each ingredient left after making the cake.
= 0.25 - Flour
= 0.33 - Butter
= 0.50 - Sugar
= 0.625 - Eggs
It says that Anna used most of her ingredients, this means she has used the ingredients which has the least amount left. The lowest out of the fractions above is . So Anna used Flour.
Also Olaf used the least of his, meaning he has most of his ingredient left. Highest value in the list is . So Olaf used Eggs.
Kristoff used more than Sven, means that Kristoff has less of his ingredient left compared to Sven. So lower value out of the values left goes to Kristoff, that is . So Kristoff used Butter.
So we are left with Sugar and Sven.
So Sven used Sugar.
