Please use " ^ " to denote exponentiation: <span>2x^2 + 3xy – 4y^2
Now let x=2 and y= -4:
2(2)^2 + 3(2)(-4) - 4(-4)^2 = 8 - 24 -4(16) = -16 - 4(16) = -5(16) = -80 (answer)</span>
Answer:
<h2>m∠EFG = 126°</h2><h2>m∠GFH = 54°</h2>
Step-by-step explanation:
If ∠EFG and ∠GFH are a linear pair, then m∠EFG + m∠GFH = 180°
(look at the picture).
We have
m∠EFG = 5n + 16
m∠GFH = 2n + 10
Substitute:
(5n + 16) + (2n + 10) = 180 <em>combine like terms</em>
(5n + 2n) + (16 + 10) = 180
7n + 26 = 180 <em>subtract 26 from both sides</em>
7n + 26 - 26 = 180 - 26
7n = 154 <em>divide both sides by 7</em>
7n/7 = 154/7
n = 22
Insert the value of n into expressions that specify angle measures:
m∠EFG = 5n + 16 → m∠EFG = 5(22) + 16 = 110 + 16 = 126°
m∠GFH = 2n + 10 → m∠GFH = 2(22) + 10 = 44 + 10 = 54°
Answer:
Equation:
Step-by-step explanation:
3y = x + 15
y + 3x = 4
To get the y-value Subtract 3x from both sides.
y = -3x + 4
Then substitute;
3(-3x + 4) = x + 15
Distribute: -9x + 12 = x + 15
Subtract x from both sides
-10x + 12 = 15
Subtract 12 from both sides
-10x = 3
Divide both sides by -10
x = 3/-10
Then to get the value of y;
y = -3(3/-10) + 4
Answer:
Step-by-step explanation:
W + 6=.75
-6 -6
W= -5.25
W + 14 / 4
-5.25 + 14 / 4 = -1.75