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vovangra [49]
3 years ago
12

Elimination 4x-7y=5 9x-7y=-15

Mathematics
1 answer:
Afina-wow [57]3 years ago
7 0

Answer:

x = -4

Step-by-step explanation:

To make this easier to explain and easier to solve, we're going to first multiply the second equation of 9x-7y=-15 by -1 to make the y coefficient positive.

This results in -9x+7y=15.

When we line up the two equations on top of each other now, we'll see that both the first and second equations have opposite y coefficients, which is vital for elimination.

The next step is to add the second equation to the first one. Teachers may tell you to subtract, but I find it easier to add if you make the two y coefficients of negative value to each other.

    4x-7y=5

+ -9x+7y=15

___________

   -5x+0y=20, or just -5x=20, because you have successfully eliminated the y         variable.

From there, you're going to solve like a normal equation (divide both sides by -5) toget you x=-4.

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At Mario's Pizza, a large pizza has a diameter of 18 inches. What is the area of two pizzas?
Oksanka [162]

Answer:

1 pizza has the area of 254 inches and plus 254 is 508

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Research results showed that experimental Drug R had a minimal to modest effect in reducing the symptoms of generalized anxiety
Angelina_Jolie [31]

Answer:

The variable that may change in response to the increase of the drug is the GAD symptoms by a 37,5%.

Step-by-step explanation:

According to the results of the first experiment with a mass of 200 mg of Drug R, they obtain a reduced of the GAD symptoms by a 25 percent evidenced by the Hamilton Anxiety Scale.

If they decided to increase the mass of Drug R to 300 mg the results expected are a increase of the porcentange of the reduced symptoms of generalized anxiety disorder, according to the tendence of the first hypothesis and the Hamilton Anxiety Scale.

We can express this increase by using the three simple rule. Where if 200 mg of Drug R reduced the 25% of the GAD symptoms, if we increase to 300 mg of Drug R how much porcentage this amount will be reduced.

Doing the maths 300mg × 25%=7500mg%,

    ⇒ 7500mg% ÷ 200mg = 37,5%.

<u>In conclusion</u> if they increased the mas of Drug R to 300 mg they will be reduced the generalized anxiety disorder (GAD) to a 37,5%.

3 0
3 years ago
Graph f(x)=4x^3-4x-2
maw [93]

Answer:

minimum: (\frac{\sqrt{3} }{3} , -\frac{8\sqrt{3} }{9}-2)

maximum: (-\frac{\sqrt{3} }{3} , \frac{8\sqrt{3} }{9}-2)

vertical intercept: (0 , -2)

Step-by-step explanation:

3 0
3 years ago
Which of the following sets of numbers could not represent the three sides of a right<br> triangle?
umka21 [38]

Answer:

{48, 64, 81}

Step-by-step explanation:

7 0
3 years ago
Please answer ASAP! The Fergusons decided to book the room at the price that Mrs. Ferguson was given, $2075, because it included
Alex787 [66]
So what you should do is
15% off, then add tax or
2075 times 0.85 times 1.185=2090.04 about

you can't just add and subtract percents because they are percents of different things

what he did was
he found 15% of 2075 and 18.5% of 2075 then found the difference and added to 2075 to find his total

what he should have done is
found the discounted price (15% off) then found the tax on that


first way
2075 times 0.15=311.25
2075-311.25=1763.75
1763.75 times 0.185=326.29375
1763.75-326.29375=2090.04

2nd way (easy, if you understand commutative property and stuff)
100-15=85
1+0.185=1.185
2075*0.85*1.185=2090.04


answer should be $2090.04
7 0
3 years ago
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