Astudent is trying to solve the system of two equations given below:

equation p: y + z = 6
equation q: 8y + 7z = 1

which of the following is a possible step used in eliminating the y-term?
a (y + z = 6) ⋅ −8
b (y + z = 6) ⋅ 7
c (8y + 7z = 1) ⋅ 7
d (8y + 7z = 1) ⋅ 8

Option A

The possible step used in eliminating the y-term in Equation P: y + z = 6  Equation Q: 8y + 7z = 1 is (y + z = 6) ⋅ −8

SOLUTION:

Given that, A student is trying to solve the system of two equations given below:  

Equation P: y + z = 6  

Equation Q: 8y + 7z = 1  

we have to find which of the given steps is a possible step used in eliminating the y-term?

We know that, while solving the system of equations, if we want to eliminate any one of the variables then, co efficient of that variable must be same in both equations but should differ by sign.

Now, let us check it.

Here coefficient of y in P is less than in Q, so let us multiply P with coefficient of y in Q and with opposite sign.

Then, (y + z = 6) . -8

Hence, the correct option is A.

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )

answer: 1 + 1 = 11

step-by-step explanation: