You +8 on each side then solve you should get n=6
Answer: Marcus travels at 5mph and Cody travels at 11mph
Step-by-step explanation:
x = Marcus
x + 6 = Cody
4(x + x + 6) = 64
4x + 4x + 24 = 64
8x + 24 = 64
8x = 40
40/8 = 5
5 + 6 = 11
Marcus = 5 Cody = 11
4*5 + 11*4 = 64
Answer:
see explanation
Step-by-step explanation:
given that r varies jointly with x and y then the equation relating them is
r = kxy ← k is the constant of variation
To find k use the condition r = 15 when x = 3 and y = 4
k = = = 1.25
r = 1.25xy ← equation of variation
When x = 16 and y = 1.25, then
r = 1.25 × 16 × 1.25 = 25
We know that this parabola intecepts the x-axis in 6 and -3. This means that is a vertical axis parabola. But also we know that our parabola passes through (1,10). Graphing these we conclude that is a concave down parabola
The general formula for this is:
To solve this we need to form a 3 equations system with our three points
We can solve for c in the first one
and replace in the second one and solve for b:
And replace c and b in the third equation:
Solve for a:
so b and c:
So:
Choice C, x-2y=4, Subsitute 0 for y and see what x is. Do the same for the y-intercept