Trên 1 nửa mặt phẳng có bờ chưa tia Ox vễ 2 tia Oy và Oz sao cho góc xOy = 60 độ , góc xOz = 120 độ . a. Tính số đo góc yOz b.Gọ
1 answer:
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Answer:
the cost of one hot chocolate is $2.
Step-by-step explanation:
Let x be the hot chocolate cost and y be the newspaper cost.
Given:
A newspaper and three hot chocolates cost $7
So, the equation is
--------(1)
Two newspapers and two hot chocolates cost $6
So, the second equation is.
---------(2)
Find one hot chocolate cost?
Solve equation 1 for y.
Put y value in equation 2
negative sign is cancelled both side.
Therefore, the cost of one hot chocolate is $2.
Answer:
Step-by-step explanation:
(Subtract
from both sides of the equation to isolate
)
(Simplify)
(Symmetric Property of Equality)
(Divide both sides of the equation by
to get rid of
's coefficient; remember that
, so
has a coefficient of
)
(Simplify)
Hope this helps!