If 3x + 7y = 12 and x-y= 1, then what is the value of 5x + 5y?
1 answer:
Answer:
14.
Step-by-step explanation:
3x + 7y = 12
x - y = 1 Multiply this by -3:
-3x + 3y = -3 Add this to equation 1:
0 + 10y = 9
so y = 9/10 = 0.9.
x - 0.9 = 1
x = 1.9.
So 5x + 5y = 5*1.9 + 5*0.9
= 14.
You might be interested in
Answer:
<u>Identities used:</u>
- sin²θ + cos²θ = 1
- cos2θ = cos²θ - sin²θ
#1
- sin2θ = 3/4, and θ in the first quadrant
- cos²2θ = 1 - sin²2θ
- cos2θ = √(1 - sin²2θ) = √(1 - 9/16) = √(7/16) = √7 / 4
#2
- sinθ(cos²θ - cos2θ) =
- sinθ(cos²θ - (cos²θ - sin²θ) =
- sinθ(sin²θ) =
- sin³θ
Answer:
part b will be your answer right there sir
Answer:
b=1
Step-by-step explanation:
-11+3(b+5)=7
-11+3b+15=7
-11+15+3b=7
4+3b=7
3b=7-4
3b=3
3b/3=3/3
b=1
hope it's helpful
Answer:
-8π or -25.13
Step-by-step explanation:
Answer:
n54
Step-by-step explanation:
