4x + 8y = 20
- 4x + 2y = -30
find y first
in order to find y eliminate x
add the two equations together
4x+-4x+8y+2y= 20+-30
4x-4x+8y+2y= 20-30
10y= -10
divide both sides by 10 to get y by itself
10y/10= -10/10
y= -1
find x by using the substitution method
- 4x + 2y = -30
-4x+2(-1)=-30
-4x-2= -30
move -2 to the other side
sign changes from -2 to +2
-4x-2+2= -30+2
-4x= -28
divide both sides by -4
-4x/-4= -28/-4
x= 7
answer:
(7,-1)
Answer: If by m you mean meters and not a variable, then you get 4 for the length of the sides. If you mean m as a variable, then the answer is 2m
Step-by-step explanation: First simplify the equation by squaring 4. This gives you the area, which is 16. Then take the square root of 16 to get the area, which is 4. If m is a variable in the equation then you must take the square root of (4m^2) and the answer you get for the side length you get is 2m
Answer:
f=6
Step-by-step explanation:
Simplifying
42 = 7f
Solving
42 = 7f
Solving for variable 'f'.
Move all terms containing f to the left, all other terms to the right.
Add '-7f' to each side of the equation.
42 + -7f = 7f + -7f
Combine like terms: 7f + -7f = 0
42 + -7f = 0
Add '-42' to each side of the equation.
42 + -42 + -7f = 0 + -42
Combine like terms: 42 + -42 = 0
0 + -7f = 0 + -42
-7f = 0 + -42
Combine like terms: 0 + -42 = -42
-7f = -42
Divide each side by '-7'.
f = 6
Simplifying
f = 6