hello ppl. please please help me solve this 4 problems. its my homework and I have to give it to teacher hours later.
I can't solve it, I tried so hard but I dont understand this so called Integers theorem.

problems {8 ,10, 12} from first picture
and also the problem {2} in the second picture.

Thank you, Thank you, Thank you ....

2. ## i solved no 8 myself

is it true? thank you

3. ## I solved number 12 also

is this true? thank you

4. Those are both correct. But for no.12, you should probably write the solution as $x\equiv12\!\!\!\!\!\pmod{17}$ (all the other solutions are equal to the first one plus a multiple of 17).