An equation is formed of two equal expressions. The cost of a new book is $7.43, while the cost of an old book is $8.86.
<h3>What is an equation?</h3>
An equation is formed when two equal expressions are equated together with the help of an equal sign '='.
Given the cost of 14 used books is $124. Therefore, the cost of a single used book is,
Cost of single used book(u) = 124/14 = $8.86
Also, the cost of 12 used books and 4 new books is $136. Therefore, the equation can be written as,
12u + 4n = 136
12(8.85) + 4n = 136
106.2 + 4n = 136
n = $7.43
Hence, the cost of a new book is $7.43, while the cost of an old book is $8.86.
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Answer:
There intersecting lines
Step-by-step explanation:
5x+2y=-8
-5x -5x
2y=-8 -5x
/2 /2 /2
y=-4 -5/2x also
y=-5/2x - 4
&
y=5/2x - 19
neither parallel (slope is not the same)
or perpendicular (slope is not reciprocal or opposite signed)
hope i helped
Answer:
x² + y² = 6.25
Step-by-step explanation:
The standard equation of a circle is ( x – h)² + ( y - k)² = r² where the center is (h, k) and r is the radius.
From your given information that the center is (0, 0) then both h and k are 0. Then r is 2.5, so
( x – 0)² + ( y - 0)² = (2.5)²
x² + y² = (2.5)²
x² + y² = 6.25
Answer:
Rearranging Formula. This unit covers rearranging formulae. The manipulation of algebraic expressions is an important ... Changing the subject of a formula .
Step-by-step explanation:
2x^2-12x+18 this is the answer from my friend
