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Lana71 [14]
3 years ago
8

If the check after the substitution of the answer doesn't work, does that mean that the result is incorrect for equation with va

riables on both sides
Mathematics
1 answer:
Alecsey [184]3 years ago
8 0
I don't understand what your point is. Mind posting a picture or something?
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Add the following Linear Expressions.<br> (-6y - 3) + 5 (3+2.5y)
amm1812
Answer= 6.5y+12

distribute the 5 in the parentheses:
(-6y-3) + (15+12.5y)
(you can take away the parentheses after this step)

then add like terms together.
12.5y + (-6y) = 6.5y
15 + (-3) = 12

make it one expression.
6.5y + 12
4 0
3 years ago
Divide. 3.2 ÷ 0.8 help me e pleaseeeeeeeeeeee !!!!!!
Talja [164]
\frac{3.2}{0.8} = \frac{32}{8} = \frac{4\times 8}{8} = 4
4 0
3 years ago
Read 2 more answers
Help me please with the problem!!!!!!
NISA [10]

Answer:

D. 8

Step-by-step explanation:

We need to count how many are longer than 7.  There are 4 leaves that are 7 inches long. 3 are 8 inches long. 1 in 9 inches long. Adding these up gives us our answer. Let x be the leaves 7 inches or longer.

4+3+1=x

Add 3 and 1.

4+4=x

Add 4 and 4

8=x

There are 8 leaves that are 7 inches or longer.


4 0
3 years ago
Anyone know how to do this? Look at picture
wlad13 [49]
A) if they were the same function, they would have identical graphs ⇒ it's not A
B) it's flipped vertically, but it's not moved ⇒it's not B
C) it's flipped vertically, not horizontally ⇒ it's not C
So it must be D)

6 0
3 years ago
The line y = hx - 2 where h &gt; 0 meets the curve 3y² = 9x² - 6x + 1.
I am Lyosha [343]

Answer:

h=6

Step-by-step explanation:

since y =hx -2 is an equation for a line which intersects with the curve 3y^2 = 9x^2 - 6x +1. The point of intersection, let's say (x_1,y_1), should satisfy the two equations. As a result, the value of y in the second equation can be replaced with the value of y in the first equation as the following,

3y^2 = 3(hx-2)^2 = 9x^2 - 6x +1\\3(h^2x^2 -4hx + 4) = 9x^2 - 6x + 1\\3h^2 x^2 -12hx +12 = 9x^2 - 6x +1

therefore, the latter equation can be rewritten in a quadratic equation form as the following,

(9 - 3h^2) x^2 + (12h-6)x + (1-12) = (9 - 3h^2) x^2 + (12h-6)x -11 = 0

if the line is tangent to the curve, it means that the line touches the curve at one point, therefore the discernment of the second order equation will be equal to zero for the famous quadratic equation solution.

b^2 -4ac =0

where a=9-3h^2, b=12h-6 and c=-11, as a result, the following equations can be deduced,

(12h-6)^2 - 4*(9-3h^2)*(-11) = (144h^2 -144h +36) - (36 -12h^2)*(-11)=\\(144-(-12)*(-11)h^2 )  -144h +36 -(36*(-11)) =\\12 h^2 -144h +432 =0

therefore, dividing both sides by 12

h^2 -12 +36 =0\\(h-6)^2 =0\\h=6

8 0
2 years ago
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