Serina wants to solve the following system of equations in the most efficient way. 2 x plus 3 y is equal to 18 x plus 7 y is equal to 31 She plans to solve for x in the first equation as her first step since both 2 and 3 can be divided into 18 Why is Serina mistaken?
Answer
A
Serina should have solved for y in the first equation because the division step will be easier since 18 is divisible by 3 .
B
Serina should have solved for y in the first equation because dividing by 3 instead of by 2 would give a smaller number in the solution.
C
Serina should have solved for x in the second equation because it has a coefficient of 1 .
D
Serina should have solved for y in the second equation because it has the largest coefficient.