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annakoslovsky3040
03.08.2019 •
Mathematics
What is the y-coordinate of the solution of the system of equations? {y=2x+14 −4x−y=4 enter your answer in the box. y =
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Ответ:
The given system of equations is :
y=2x+14 ...(1)
−4x−y=4 ... (2)
We can solve the above system of equation by method of substitution. Frm equation (1) we have y=2x+14. So, first step is to substitute 2x+14 for y in equation (2). Hence,
-4x - (2x + 14) = 4
-4x - 2x - 14 = 4
- 6x -14 = 4 By combining the like terms.
-6x - 14 + 14 = 4 + 14 Add 14 to each sides of the equation.
- 6x = 18
x = -3.
Next step is to plug in x=-3 in equation (1) to get the value of y. Therefore,
y = 2(-3) + 14
= -6 +14
= 8
So, y=8.
Ответ:
Step-by-step explanation:
f(x)=3x-8
g(x)=2x^2
f(g(5))=f(2×5^2)
=f(50)
=3×50-8
=150-8
=142