Given the system of linear equations. choose all of the options that could be used to solve the system using addition x + y = 7 2x + y = 5 (could be more than one answer) 1.multiply the first equation by -1 and add the equations together. 2.multiply the second equation by -1 and the first equation by -1, then add the equations together. 3.multiply the second equation by -1 and add the equations together. 4.multiply the first equation by -2 and add the equations together. 5.multiply the first equation by 2 and the second equation by -1, then add the equations together.

Option 1, Option 3, Option 4, Option 5

Step-by-step explanation:

Here two equations are given,

x + y = 7    (1)

2x + y = 5  (2)

Check option 1

Multiply the first equation by -1 and add the equations together.

-x - y = -7

2x+y = 5    correct

Similarly,

Option 1, Option 3, Option 4 and Option 5 are correct.

That's the final answer.

I hove it will helps you.

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.