Answer:
Step-by-step explanation:
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Hello,
tan (t)<0
==> sin (t) /cos (t)<0
==>1 / cos (t)<0 [since sin (t) ≠0, dividing by sin (t) ]
==> cos (t) <0
Given the system of equations:

To solve it by substitution, follow the steps below.
Step 1: Solve one linear equation for x in terms of y.
Let's choose the second equation. To solve it for x, add 3y to each side of the equations.

Step 2: Substitute the expression found for x in the first equation.

Step 3: Isolate y in the equation found in step 2.
To do it, first, add 48 to both sides.

Then, divide both sides by 15.

Step 4: Substitute y by 5 in the relation found in step 1 to find x.

Answer:
x = -9
y = 5
or (-9, 5)
Also, you can graph the lines by choosing two points from each equation, according to the picture below.
Answer:
Step-by-step explanation:
3 12
8
96 = 3x
x=32. the perimeter is 32
Answer:
c
Step-by-step explanation:
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