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ira [324]
3 years ago
9

Solve the following system by elimination. 4x + 8y = 20 -4x + 2y = -30

Mathematics
1 answer:
weeeeeb [17]3 years ago
7 0
1. y= -1/2x + 5/2
2.y= 2x-15
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Solve the equation<br><br><img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B3%7D%7B8%7Dx%20-%2017%20%3D%2010" id="TexFormula1" titl
Annette [7]

Answer:

x = 72

Step-by-step explanation:

<u>To solve for 'x', isolate it</u>. This means to keep 'x' on one side of the equal sign, while moving the other numbers to the other side. The numbers on the other side will tell you what 'x' equals to.

<u>When 'moving' a number to the other side, you cancel it out where it originally is by doing reverse operations</u>. (Reverse operation pairs are addition/subtraction and division/multiplication). To keep an equation balanced, <u>what you do to one side you have to do to the other</u>.

\frac{3}{8}x-17=10        Keep 'x' on the left and move everything over.

\frac{3}{8}x-17+17=10+17        Add 17 to both sides. "-17" cancels out on the left.

\frac{3}{8}x=27        Simplified right side

\frac{3}{8}x/\frac{3}{8}=27/\frac{3}{8}        Because 3/8 originally multiplies with 'x', do the reverse: divide both sides by 3/8.

x=27/\frac{3}{8}        To divide a fraction, change to multiplication and flip the fraction's top and bottom numbers.

x=27*\frac{8}{3}        Combine the factors into one fraction.

x=\frac{27*8}{3}        Multiply 27 by 8 in the numerator.

x=\frac{216}{3}        Simplify the fraction by dividing top by bottom.

x=72        Final answer, solved for 'x'

5 0
3 years ago
Giving away another 100 better get there fast
kari74 [83]
GOT IT AGAIN THANKS
3 0
4 years ago
Read 2 more answers
Is -24 a solution to the equation -16+2x=-64
S_A_V [24]

Answer:

It is a solution

Step-by-step explanation:

To check and see if it is a solution, we can substitute it in

-16 +2(-24) = -64

-16 -48 = -64

-64=-64

Since this is true, it is a solution

3 0
4 years ago
Larry is flying at an altitude of 3,000 feet above ground level. Ground level is 188 feet above sea level. If he descends 567 fe
uranmaximum [27]
3000-188-567+120=2365 <span> 
</span>
7 0
3 years ago
Read 2 more answers
ZA and B are supplementary angles. If mA = (7x + 7)° and m
Wittaler [7]

Answer:

∠B = 54 °

Step-by-step explanation:

If sum of two angles add up to 180°, then the two angles are called supplementary.

   m∠A + m ∠B = 180°

7x + 7 + 4x - 14 = 180

7x + 4x + 7 - 14 = 180

        11x  - 7       = 180

                    11x = 180 + 7

                     11x = 187

                        x = 187 ÷ 11

                       \sf \boxed{x = 17^\circ}

m∠B = 4x - 14

        = 4*17 - 14

         = 68 - 14

\sf \boxed{\bf \angle B = 54^\circ}

5 0
1 year ago
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