Question

Solve equations by equalization method X-8=-2y 2x+y=7

261

likes
1306 views

Answer to a math question Solve equations by equalization method X-8=-2y 2x+y=7

Expert avatar
Frederik
4.6
94 Answers
$\left\{\begin{array} { l } 3x-8=-2y \\ 2x+y=7\end{array} \right.$
$\left\{\begin{array} { l } -2y=3x-8 \\ 2x+y=7\end{array} \right.$
$\left\{\begin{array} { l } -2y=3x-8 \\ y=7-2x\end{array} \right.$
$\left\{\begin{array} { l } y=-\frac{ 3 }{ 2 }x+4 \\ y=7-2x\end{array} \right.$
$-\frac{ 3 }{ 2 }x+4=7-2x$
$x=6$
$y=7-2 \times 6$
$y=-5$
$\left( x, y\right)=\left( 6, -5\right)$
$\left\{\begin{array} { l } 3 \times 6-8=-2 \times \left( -5 \right) \\ 2 \times 6+\left( -5 \right)=7\end{array} \right.$
$\left\{\begin{array} { l } 10=10 \\ 7=7\end{array} \right.$
$\left( x, y\right)=\left( 6, -5\right)$

Frequently asked questions (FAQs)
Question: The distance between two cities is 300 km. If a car travels at a speed of 60 km/h, what is the total time taken for the journey?
+
What is the resultant displacement if two vectors, A and B, with magnitudes 4 units and 7 units respectively, are added together?
+
What is the mean, mode, median, range, and average of this dataset: 5, 8, 10, 12, 12, 15, 20, 23?
+
New questions in Mathematics
1 + 1
-6n+5=-13
5(4x+3)=75
Find the equation of the normal to the curve y=xΒ²+4x-3 at point(1,2)
how many arrangement can be made of 4 letters chosen from the 8 letters of the world ABBSOLUTE
By direct proof, how can you prove that β€œThe sum of any three consecutive even integers is always a multiple of 6”.
5.- From the probabilities: 𝐏(𝐁) = πŸ‘πŸŽ% 𝐏(𝐀 ∩ 𝐁) = 𝟐𝟎% 𝐏(𝐀 Μ…) = πŸ•πŸŽ% You are asked to calculate: 𝐏(𝐀 βˆͺ 𝐁)
If 0101, what is the binary representation of the 4x16 decoder output?
What is 28 marks out of 56 as a percentage
Two business partners have a bank balance of $17,942.00. After the first year their interest brings their balance to $18,928.91. What rate of interest is earned?
suppose random variable x follows poisson distribution with expected value 3. what is variance of x?
Calculate the value of a so that the vectors (2,2,βˆ’1),(3,4,2) and(a,2,3) are coplanar.
From 1975 through 2020 the mean annual gain of the Dow Jones Industrial Average was 652. A random sample of 34 years is selected from this population. What is the probability that the mean gain for the sample was between 400 and 800? Assume the standard deviation is 1539
effectiveness of fiscal and monetary policy under closed and open economies
A diamond ring was reduced from $999.99 to $689.99. Find the percent reduction in the price. Round the answer to the nearest tenth of a percent, if necessary.
Calculate the area of the parallelogram with adjacent vertices (1,4, βˆ’2), (βˆ’3,1,6) 𝑦 (1, βˆ’2,3)
What is the total amount due and the amount of interest on a 3-year loan of $1,000 at a simple interest rate of 12% per year?
22. Let [AB] be a chord in a circle C, and k a circle which is internally tangent to the circle C at a point P and to the chord [AB] at a point Q. Show that the line P Q passes through the midpoint of the arc AB opposite to the arc APB.
5a-3.(a-7)=-3
f(x)= 9-x^2 find (f(x+h)-f(x) )/h