Rahul tried to check whether x=1.5 is a solution of 4x−0.8=5.2 as shown below:
Step I: 4(1.5)−0.8=5.2
Step II: 6−0.8=5.2
Step III: 6−0.8=4.4
Step IV: 4.4=5.2
Which option best describes Rahul’s work?
a) He made an error in Step II; 4(1.5) equals 5.2, so the equation balances.
b) He made an error in Step III; 6−0.8 equals 5.2, so x=1.5 is a solution.
c) He made an error in Step IV; he should have written 4.4=5.2, so x=1.5 is not a solution.
d) Both Steps II and III are incorrect; therefore x=1.5 cannot satisfy the equation.