Answer:
39°
Step-by-step explanation:
i just took the test
x+y=4
-x+y=2
We solved this equations system by reduction method:
x+y=4
-x+y=2
-----------------
2y=6 ⇒y=6/2=3
x+y=4
-(-x+y=2)
---------------
2x=2 ⇒x=2/2=1
answer: x=1; y=3
substitution method
x+y=4
-x+y=2
x=4-y
-(4-y)+y=2
-4+2y=2
2y=2+4
2y=6
y=6/2=3; then x=4-y=4-3=1
answer: x=1; y =3
equalization method
x+y=4 ⇒y=4-x
-x+y=2 ⇒y=2+x
Therefore:
4-x=2+x
-x-x=2-4
-2x=-2
x=-2/-2=1; then; y=4-x=4-1=3
Answer: x=1; y=3.
Table 2 represents a proportional relationship because if you divide 3 divided by 2 you get 1.5 and you will get the same for 4.5 divided by 3, 6 divided by 4, 7.5 divided by 5