Answer:
x= -1/2 and y=-5/2
Step-by-step explanation:
Step 1: Solve x−y=2 for x:
x−y=2
x−y+y=2+y(Add y to both sides)
x=y+2
Step 2: Substitute y+2 for x in x+y=−3:
x+y=−3
y+2+y=−3
2y+2=−3(Simplify both sides of the equation)
2y+2+−2=−3+−2(Add -2 to both sides)
2y=−5
Divide both sides by 2.
y=-5/2
Step 3: Substitute -5/2 for y in x=y+2:
x=y+2
x=-5/2+2
x= -1/2 (Simplify both sides of the equation)
Answer: x= -1/2 and y=-5/2
128,147.............................................
Answer:
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Step-by-step explanation:
dddddddddddddddddd
7000 • 5 • 3 = 105,000
Hope this helps!
9514 1404 393
Answer:
(x, y, z) = (-1, 0, -3)
Step-by-step explanation:
We notice that the coefficients of z are such that elimination of the z term from the equations is made easy.
Adding equations 1 and 2:
(2x -3y -2z) +(x +3y +2z) = (4) +(-7)
3x = -3
x = -1
Adding equations 2 and 3:
(x +3y +2z) +(-4x -4y -2z) = (-7) +(10)
-3x -y = 3
Substituting for x, we get ...
(-3)(-1) -y = 3
0 = y . . . . . . . . . . . add y-3 to both sides
Then z can be found from any equation. Substituting for x and y in the second equation gives ...
-1 +2z = -7
2z = -6 . . . . . add 1
z = -3 . . . . . .divide by 2
The solution is (x, y, z) = (-1, 0, -3).
