Capicus8710
19.01.2021 •
Mathematics
IF 5 NEW CLASSMATES WERE IN A CLASSROOM AND EACH STUDENT SHAKES THE HAND OF EACH OF THE OTHER STUDENTS IN THE CLASS, HOW MANY TOTAL HAND SHAKES WILL THERE BE. WHAT IS A METHOD YOU CAN USE TO SOLVE THIS. (PLEASE USE COMPLETE SENTENCES).
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Ответ:
x=-2, y=-3
Step-by-step explanation:
we can rearrange the questions to make it easier
y=3x+3
2y=-3x-12
if you add the two equations, you get
3y=0x-9
so y=-9/3 = -3
plug y into one of the equations
-3=3x+3
-6=3x
x=-2
and then check your work by plugging into the other equation:
2*-3=-3(-2)-12
-6=6-12
-6=-6