Makahanap ng mga eksaktong solusyon sa iyong mga problema gamit ang IDNStudy.com. Alamin ang mga detalyadong sagot mula sa mga bihasang miyembro ng aming komunidad na sumasaklaw sa iba't ibang paksa para sa lahat ng iyong pangangailangan.

what number must added to -15 produce +7 ?

Sagot :

First, write this in linear equation:
Let x be the unknown number, it can be shown like this:

x+(-15)=+7
or
x-15=7
Transfer the 15 to the other side and change its sign: The -15 will become +15 after transferring to the other side.
x=7+15
Simplify it by doing the operations:
x=22
Check:
22+-15=7
22-15=7
7=7, Correct! 
Therefore the number that must be added to -15 to produce +7 is 22.
[tex]Let\ x\ be\ the\ unknown\ number. \\ \\ Solution; \\ -15+x=7 \\ \\ x=7+15(Transpose\ 15\ to\ the\ other\ side.) \\ \\ \boxed{\boxed{x=22}} \\ \\ Checking; \\ Let\ \boxed{x\to22} \\ \\ -15+x=7 \\ \\ -15+22=7 \\ \\ \boxed{\boxed{7=7}}\ \underline{TRUE} \\ \\ Hope\ it\ Helps:) \\ Domini[/tex]