3 years ago

Please help solve for y 5x-4y=10

Mathematics

1 answer:

a_sh-v [17]3 years ago

7 0

x is -2 and y is -5/2 hope this helps

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Explain how to use equivalent ratios to find 125% of 200.

ikadub [295]

125 of 200 can be wriiten as:
125
200
Multiply both numerator & denominator by 100

125
200
×
100
100
=
62.5
100
= 62.5%
If you are using a calculator, simply enter 125÷200×100 which will give you 62.5 as the answer.

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Carlton spent $21.85 on lunch for himself and a friend. About how much should he leave for a 15% tip?

madreJ [45]

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BabaBlast [244]

Answer:

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3 years ago

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{(4x+2y=6),(-2x+2y=18):} Solve by using the elimination method

Degger [83]

Answer:

$\displaystyle [-2, 7]$

Step-by-step explanation:

You want to eradicate one pair of variables so they are set to zero. It does not matter which pair is selected:

$\displaystyle \left \{ {{4x + 2y = 6} \atop {-2x + 2y = 18}} \right.$

{½[4x + 2y = 6]

{−2x + 2y = 18

>> $\displaystyle \left \{ {{2x + y = 3} \atop {-2x + 2y = 18}} \right. \\ \\ \frac{3y}{3} = \frac{21}{3} \\ \\ \\ y = 7$

Plug this back into the system to get the x-value of $\displaystyle -2.$

I am joyous to assist you at any time.

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2 years ago