Find the angles a, b, c and d.

Mathematics

2 answers:

horsena [70]3 years ago

8 0

Answer:

a=101 b=79 c=83 d=97

Step-by-step explanation:

Alborosie3 years ago

6 0

A=180-79= 101°

B=75°

C=83°

D=101°

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mina [271]

Answer:

slope = -3; y-intercept = 1/2

Step-by-step explanation:

A way to solve this problem would be to write equations based off of the answer choices on the right, plug the x and y values from the chart into those equations, and see if they are true.

Let's look at the third option choice. Given that the slope = -3 and the y-intercept is 1/2, we can write an equation using the slope-intercept format, y= mx + b, where m is the slope and b is the y-intercept. So, the equation for that would be y= -3x + 1/2.

Let's try plugging in some x and y values and testing if they are true. Let's take the point $(-1, 3\frac{1}{2} )$ from the chart for example:

$(3\frac{1}{2}) = -3(-1) + \frac{1}{2} \\(3\frac{1}{2}) = 3 + \frac{1}{2} \\3\frac{1}{2}= 3\frac{1}{2}$

So, since $3\frac{1}{2}$ does equal to $3\frac{1}{2}$ , it is true, making that the correct answer. You could plug in any other point from the chart to check, too - it's good to check multiple, but for the sake of brevity, I just put that as one example.