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fiasKO [112]
3 years ago
9

Solve the following system of equations algebraically: Y = x^2 + 8x – 9 Y = 2x + 7

Mathematics
1 answer:
julia-pushkina [17]3 years ago
3 0
Use simultaneous equations:
2x + 7 = x^2 + 8x - 9
7 = x^2 + 6x - 9
16 = x^2 + 6x
+ or - 4 = 7x
answer is
-4/7 or 4/7
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Two angles of a triangle are 30°and 80°. Find the third angle.
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Answer:

The third angle of the triangle is 70°.

Step-by-step explanation:

The two angles of a triangle (say Δ ABC) are given to be 30° and 80°.

We have to find the third angle.

Let us assume that ∠ A = 30° and ∠ B = 80°, then we have to find ∠ C.

Now, we know that, ∠ A + ∠ B + ∠ C = 180° {Property of a triangle}

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⇒ ∠ C = 180° - 30° - 80° = 70°

Therefore, the third angle of the triangle is 70°. (Answer)

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Step-by-step explanation:

let the four numbers be x, y, z and l respectively

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Step-by-step explanation:

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