Jill solved the inequality -x/4 < (x+2)/3

her solution is shown:

step 1 : -3x< 4x+8
step 2: -3x-4x < 8
step 3: -7x< 8
step 4: x< -8/7

explain the mistake jill made while solving for x.

i don't see anything is it a trick

Jill did not change the symbol of inequality from minor (< ) to major (>) in the Step 4

Step-by-step explanation:

we have

step 1

Multiply by 12 both sides

step 2

Group terms

step 3

Combine like terms

step 4

Divide by -7 both sides

Remember that when you multiply an inequality by -1 the < symbol changes to the > symbol  

so

Jill did not change the symbol of inequality from minor (< ) to major (>) in the Step 4

its an acute right triangle

step-by-step explanation:

it has to have an angle of 90 degrees