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sineoko [7]
3 years ago
15

Please help with my algebra homework and explain if you can

Mathematics
1 answer:
IRINA_888 [86]3 years ago
4 0

A= \frac{1}{2} h (x+y)

we have to solve for x , solving for x means , we have to isolate x one one side , by shifting all other variables to other side

So

A= \frac{1}{2} h (x+y)

Multiply both sides by 2

2A = h(x+y)

Divide both sides by h

2A/h = x+y

Subtract y from both sides

\frac{2A}{h}  -y =x

or

x=\frac{2A}{h}  -y

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(A) Angles in equilateral triangle are congruent

Step-by-step explanation:

From the figure, it can be seen that in triangle ABD, AB=BD=AD which means that all the sides of the triangle are congruent and by the definition of equilateral triangle, ΔABD will be an equilateral triangle.

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Read 2 more answers
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zysi [14]

Answer:

(14, -2)

Step-by-step explanation:

To solve by using substitution, begin by solving for a variable in the first equation. Let's solve for x:

x+8y=-2\\x=-2-8y

Now we know what <em>x</em> equals. Let's substitute this into the second equation:

x-3y=20\\(-2-8y)-3y=20

We can then simplify:

-2-8y-3y=20 Given equation

-2-11y=20 Combine y terms

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So, we now know the value of y = -2.

To find the value of X, we can substitute the value of Y into one of the equations. Let's use the first one:

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So, we now know the value of x = 14.

Therefore, we know a solution to the system of equations is (14, -2).

4 0
3 years ago
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