Which properties justify the steps taken to solve the system? {2a+7b=0 {3a−5b=31 drag the answers into the boxes to match each step.

Given the system:

2a+7b=0                             ......[1]

3a-5b=31                             ......[2]

Multiplication property of equality states that you multiply the same number to both sides of an equation.

i,e if a=b then

Multiply by 5 to both sides in equation [1] we get;

10a+35b=0                              ......[3]

Also, multiply by 7 to both sides in equation [2] we get;

21a-35b=217                             ......[4]

Addition property of equality states that allows one to add the same quantity to both sides of an equation.

Adding the equation [3] and [4] we get;

10a+35b+21a-35b =0+217

Simplify:

31a =217                            ......[5]

Division property of equality states that you divide the same number to both sides of an equation

Divide by 31 to both sides of an equation [5];

Simplify:

a = 7

By substitution property of equality, substitute the value of a =7 in equation [1];

Simplify:

14+7b =0                                          ......[6]

Subtraction Property of Equality states that you subtract the same number from both sides of an equation.

Subtract 14 from both sides of an equation in [6];

14+7b-14=0-14

Simplify:

7b=-14                             ......[7]

By Division Property of Equality;

Divide by 7 to both sides of an equation in [7]

Simplify:

b = -2

8

step-by-step explanation:

16 is the absolute value

step-by-step explanation: