Question

7x - 3y = 4
2x - 4y = 1

Which of the following systems is not the same as solving the system shown?

Answer 1

Following....

Answer 2

Do you have any choices..?

Answer 3

7x−3y=4;2x−4y=1
Step: Solve 7x−3y=4 for x:
7x−3y+3y=4+3y(Add 3y to both sides)
7x=3y+4
7x7=3y+47(Divide both sides by 7)
x=37y+47
Step: Substitute (37y+47) for x in 2x−4y=1:
2x−4y=1
2(37y+47)−4y=1
−227y+87=1(Simplify both sides of the equation)
−227y+87+−87=1+−87(Add (-8)/7 to both sides)
−227y=−17
−227y−227=−17−227(Divide both sides by (-22)/7)
y=122
Step: Substitute (122) for y in x=37y+47:
x=37y+47
x=37(122)+47
x=1322(Simplify both sides of the equation)
Answer:
x=1322 and y=122