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2 years ago

X-7=11 , 2x+y=19 when using elimination

Mathematics

1 answer:

12345 [234]2 years ago

6 0

X+0=18
2x+y=19

(-2)x+(-2)0=(-2)18
2x+y=19

0+y= -17
2x+ (-17)=19
2x=36

y=-17
x=18

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$\displaystyle x = \frac{3}{4}$

Step-by-step explanation:

we are given that

$\displaystyle P = \left(x, - \frac{ \sqrt{7} }{4} \right)$

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remember that,

In unit circle x coordinate is considered cos and y coordinate is considered sin

so in order to figure out x we should figure out the value of cos to do we can consider Pythagoras trig indentity

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move left hand side expression to right hand side and change its sign:

$\displaystyle \cos ^{2} ( \theta) = 1 - \frac{7}{16}$

simplify Substraction:

$\displaystyle \cos ^{2} ( \theta) = \frac{9}{16}$

square root both sides:

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