Answer:
- (x, y) = (8, -1)
- (x, y) = (7, 10.5)
Step-by-step explanation:
1. You can use the expression for y to substitute into the first equation:
2x +4(1/4x -3) = 12
2x +x -12 = 12 . . . . . . eliminate parentheses
3x = 24 . . . . . . . . . . . add 12; next divide by 3
x = 8 . . . . . matches choice C
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2. You can use the expression for y to substitute into the second equation:
x -2(2x -3.5) = -14
-3x +7 = -14 . . . . . . eliminate parentheses
21 = 3x . . . . . . . . . . add 3x+14; next divide by 3
7 = x . . . . . matches the third choice
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When the answer choices are sufficiently different, you only need to find one value to determine which is the correct choice. (If you want to check your work further, you can substitute the other answer value into the two equations to see if it works.)
Answer:
Step-by-step explanation:
Y = kx is the direct variation equation. First find k, the could variation. 16 = k * 20. Divide both sides by 20. 16/20 = k 4/5 = k. The direct variation is "y=kx" . As "x" increases the value of "y" increases.
Answer:
$266.24
Step-by-step explanation:
Use a sales tax calculator
Answer:
For the equations -x-2y=-6 and -3x+2y=6, the solution is x=0 and x=3. You can also write it as (0,3). For the equations 3x+8y=-4 and 2x-4y=16, the solution is x=4, and x=-2. You can also write it as (4,-2)
Step-by-step explanation:
Solve the systems of equations
Answer:
1.5625
Step-by-step explanation:
1 pound is $1.5625. For this, you divide the dollars by the amount(weight). You should round it to the hundredth.