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3 years ago

Solve for the unknown variable. -7x + 5 = 61

Mathematics

2 answers:

Gwar [14]3 years ago

4 0

Answer:

C, -8

Step-by-step explanation:

Subtract 5 from both sides then divide -7 to both sides to get X = -8

VladimirAG [237]3 years ago

3 0

I’m talking about a kite man like 65 inches

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3 years ago

5. What is the graph of the equation?<br> -5x + y=-3

Mariulka [41]

Answer:

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Step-by-step explanation:

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3 years ago

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Anastasy [175]

Answer:

Step-by-step explanation:

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3 years ago

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1. Write a quadratic function, in standard form, that fits the set of points. Solve it as a system of three equations

sasho [114]

Answer:

The equation is $y=2x^2+4x-7$

Step-by-step explanation:

Let the quadratic function be

$y=ax^2+bx+c$

The point (-4,9) must satisfy this function,

$\Rightarrow a(-4)^2+b(-4)+c=9$

$\Rightarrow 16a-4b+c=9...(1)$

The point (0,-7) must also satisfy this function,

$\Rightarrow a(0)^2+b(0)+c=-7$

$\Rightarrow c=-7...(2)$

The point (1,-1) must also satisfy this function,

$\Rightarrow a(1)^2+b(1)+c=-1$

$\Rightarrow a+b+c=-1...(3)$

We put equation 2 into equation 1 to get;

$\Rightarrow 16a-4b-7=9$

$\Rightarrow 16a-4b=16$

$\Rightarrow 4a-b=4...(5)$

We again put equation 2 into equation 3 to get;

$\Rightarrow a+b-7=-1$

$\Rightarrow a+b=6...(6)$

We add equation 5 and 6 to get;

$5a=10$

$\Rightarrow a=2$

We put $a=2$ into equation 6 to get;

$2+b=6$

$\Rightarrow b=6-2$

$\Rightarrow b=4$

The equation is therefore $y=2x^2+4x-7$

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3 years ago