Plz help im gonna cry Solve the following pairs of simultaneous equations by method of substitution.
1. x − y = 1
x + y = 3
2. y − x = 1
x + y = 5
3. y = 4x + 4
x + y = 14
4. a = 4 − b
2a + b = 1
5. 5x − 2b = 1
x = 5 − 2b
6. x − y = 4
x + 2y = 10
7. a − 2b = 1
3a − 4b = 1
8. 4x − 3y = 1
x − 2y = 4
9. a + 2p = 4
x − 2y = 6
10. 2x + 3y = 5
−x + 2y = 8
11. y − x = 2
2y − 4x = 10
12. x + 6y = 22
2x + 10y = 38
13. 2x − y = 5
x + y = 4
14. x + y = 7
2x + y = 10
15. x + y = 144
2x − 3y = 63

the thermometer is precise but not accurate

step-by-step explanation:

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8