Petro was given this system of equations.
-14x-2y = 24
14x+8y = -12
petro’s work is shown in the table. where, if anywhere, did petro first make a mistake?
-
a) step 1
b) step 2
c) step 3
d) no mistake

Option C step 3

Step-by-step explanation:

we have

-14x-2y=24 > equation A

14x+8y=-12 > equation B

step 1

Solve the system by elimination

Adds equation A and equation B

-14x-2y=24

14x+8y=-12

-2y+8y=24-12

6y=12

The step 1 is correct

step 2

Solve for y

Divide by 6 both sides

6y/6=12/6

y=2

The step 2 is correct

step 3

Find the value of x

substitute the value of y in the equation A

-14x-2(2)=24

-14x-4=24

14x=-4-24

14x=-28

x=-2

The step 3 is not correct

therefore

Petro first make a mistake in Step 3

4 packs of water and 7 packs of candy bars

step-by-step explanation:

35x4=140

140/20=7

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