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Rainbow [258]
3 years ago
7

HELP ME PLEASE MY LAST DAY TO TURN THIS IN! MARKING BRAINLIEST

Mathematics
1 answer:
Nitella [24]3 years ago
3 0

Answer:

3) x=1\\ y=5

4) x=-2\\ y=6

Step-by-step explanation:

3) For this system of equation you already has one variable in the second equation. Therefore, you only need to solve for y in the second one and substitute its value into the first equation to calculate x:

\left \{ {{7x + 3y= 22} \atop {4y=20}} \right. \\

y=\frac{20}{4} \\ y=5

7x + 3(5)= 22\\ 7x=7\\x=1

4) You must add both equations to cancel the variable y and solve for x. Then, susbstiute the value of this variable into one of the original equations to calculate y:

\left \{ {{-2x+y=10} \atop {4x-y=-14}} \right.

2x=-4\\ x=-2

-2(-2)+y=10\\ y=6


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Answer:

<em>√3</em>

Step-by-step explanation:

5 0
2 years ago
Which equation can be used to find 30 percent of 600
agasfer [191]
A/b *100
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5 0
3 years ago
What is the value of x?
Inessa05 [86]
3x-14=4x-9
-4x     -4x
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5 0
3 years ago
Triangle ABC is an isosceles right triangle inscribed in a circle. The center of the circle is point D and the diameter of the c
Paha777 [63]

Answer:

* AD is congruent to DC and BD <em>true</em>

* m∠B = 90° <em>true</em>

<u>* The measure of arc AC is equal to the measure of arc AB </u><u><em>not be true</em></u><em> ( The right answer  )</em>

* The measure of arc AB is equal to measure of arc BC <em>true</em>

Step-by-step explanation:

∵ D is the center of the circle and A , B and C are points on the circle

∴ AD , DB and DC are radii on the circle D

∴ AD ≡ DC ≡ DB

∵ AC passing through point D which is the center of the circle

∴ AC is the diameter of the circle D

∵ ∠B is opposite to the diameter of the circle and vertex B lies on the circle

∵ ∠B is an inscribed angle and  ∠ADC  is a central angle subtended by the same arc AC

∴m∠B = half m∠ADC

∵ m∠ADC = 180°

∴ m∠B = 90°

∵ The measure of arc AC = 180°

∵ ΔABC is isosceles and m∠B = 90°

∴ m∠BAC = m∠BCA = (180° - 90°) ÷ 2 = 45°

∵ ∠ACB is an inscribed angle subtended by arc AB

∴ m∠ACB = half measure of arc AB

∵ The measure of arc AB = 45° × 2 = 90°

∴ The measure of arc AC ≠ the measure of arc AB

∵ Δ ABC is an isosceles triangle and m∠B = 90°

∴ AB = BC

∵ AB subtended by arc AB

∵ BC subtended by arc BC

∴ The length of arc AB = the length of arc BC

∵ If two arcs are equal in length, then they will be equal in measure

∴ The measure of arc AB is equal to the measure of arc BC

3 0
3 years ago
which is grater,the greatest whole number with 4 digits or the least whole number with 5 digits?explain.
Xelga [282]
The more digits you have the bigger the number, unless you have a long decimal, and in that case only is the number smaller in value.
5 0
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