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gilbertnessa2107
16.10.2019 •
Mathematics
X- y = 2
0.2x + 0.4y = 1
the x-coordinate of the solution to the system shown is
1
3
6
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Ответ:
x - y = 2
x = y + 2
substitute y + 2 for x in the other equation
0.2(y + 2) + 0.4y = 1
0.2y + 0.4 + 0.4y = 1
0.6y = 0.6
y = 1
x - 1 = 2
x = 3
elimination:
x - y = 2
-0.2(x - y) = -0.2(2)
-0.2x + 0.2y = -0.4
-0.2x + 0.2y = -0.4
0.2x + 0.4y = 1
0.6y = 0.6
y = 1
x - 1 = 2
x = 3
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Ответ:
the answer is B. 3
Step-by-step explanation:
Ответ:
Step-by-step explanation:
We want to simplify:
Use the Pythagorean identity:
We apply this property to get:
This gives us:
We simplify to get:
Apply the complementary identity;