66) ten less than a number
Let the number be n
= n - 10
67) the product of x and y
= x × y or xy
68) The algebraic expression for ten less than n
= n - 10
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ANSWER
(3, 11) and (−3, −7)
EXPLANATION
The given system of equations are:

and

or

We equate the two equations to obtain,

We rewrite in standard quadratic form to obtain,

This simplifies to

We solve for x to obtain,




When


When x=-3,

Therefore the solution for the system is (3, 11) and (−3, −7).
Answer:
y=-2/3x-1
Step-by-step explanation:
2π radians is equal to 360° which is just π rad/180° so:
120°(π/180°)=2π/3
Answer:
The real solution is
.
Step-by-step explanation:
while 
So the equation becomes:



We know that
. So let's see what
gives us:
.
is the result we wanted.
is therefore a solution.