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RUDIKE [14]
2 years ago
7

Solve the equation for y. Then find the value of y for each value of x.3x-7y=13;x= -3, 0, 3

Mathematics
1 answer:
Sidana [21]2 years ago
7 0

When x is -3

3\left(-3\right)-7y=13\quad :\quad y=-\frac{22}{7}\quad \left(\mathrm{Decimal}:\quad y=-3.14285\dots \right)

When x is 0

3\cdot \:0-7y=13\quad :\quad y=-\frac{13}{7}\quad \left(\mathrm{Decimal}:\quad y=-1.85714\dots \right)

When x is 3

3\cdot \:3-7y=13\quad :\quad y=-\frac{4}{7}\quad \left(\mathrm{Decimal}:\quad y=-0.57142\dots \right)

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I started by labeling the right angle (Angle C) 90º. Next, I wrote down everything in one equation.

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Next, I add 20 on both sides.

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I combine like terms (2x and 3x)

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I subtract 90 from both sides.

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Divide 110 by 5 to get x.

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======

For problem two, I label all the angles I know.

49º + 80º + r = 180º

I add 80 and 49.

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I subtract 180 and 129 and get 51º, which is your angle for R.

For angle X, you know that angle R plus angle X equals half of a circle, which is 180º

We know from before that 129º is 180º without R, so X is 129º

I hope this helps! Let me know if I'm wrong!

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Answer: Hope this helps you! (I cant fill in the blank since  can't see the choices.)

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