Answer:
x = -2
, y = 3
Step-by-step explanation:
Solve the following system:
{4 x + 5 y = 7
y = 3 x + 9
Hint: | Perform a substitution.
Substitute y = 3 x + 9 into the first equation:
{4 x + 5 (3 x + 9) = 7
y = 3 x + 9
Hint: | Expand the left hand side of the equation 4 x + 5 (3 x + 9) = 7.
4 x + 5 (3 x + 9) = (15 x + 45) + 4 x = 19 x + 45:
{19 x + 45 = 7
y = 3 x + 9
Hint: | Choose an equation and a variable to solve for.
In the first equation, look to solve for x:
{19 x + 45 = 7
y = 3 x + 9
Hint: | Isolate terms with x to the left hand side.
Subtract 45 from both sides:
{19 x = -38
y = 3 x + 9
Hint: | Solve for x.
Divide both sides by 19:
{x = -2
y = 3 x + 9
Hint: | Perform a back substitution.
Substitute x = -2 into the second equation:
Answer: {x = -2
, y = 3
<h3>I'll teach you how to find the period of f(x)=sin(x)</h3>
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A period of a sin is is the length of one cycle.
The original period of the sine curve is 2π.
If x is multiplied by a constant that can change the answer of the period.
The period of the basic sine function f(x) = sin(x) is 2π.
Your Answer Is 2π.
plz mark me as brainliest if this helped :)
3.2=x______________________________
Answer: <em>23 1/24 CM.</em>
-- <u><em>I hope you stay safe and extra healthy. Don't let those annoying hands of yours touch your germ-free face! Make sure to wash your hands extra this time and use a lot of PURELL, just, don't dry your hands out, so, make sure you have enough hand lotion. Hope this helped! (Also, masks are great! Don't use gloves because you put germs on the gloves, then, when you take them off, you touch the germs that were on your gloves.)</em></u><em> </em>
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<em> ~ </em><u><em>Mattie</em></u>
