Answer:
Step 2
Step-by-step explanation:
During step 2, when dividing by 4 on both sides, Jessica got -16 / 4 was 4, which is not true. Basically she switched the sign when she shouldn't have.
Answer:
i want to say 180 but try that and if its wrong im deeply sorry
Step-by-step explanation:
Answer:
x = - 9
Step-by-step explanation:
Given
3x + 2 = 2x - 7 ( subtract 2x from both sides )
x + 2 = - 7 ( subtract 2 from both sides )
x = - 9
Let she work for x hours as carpenter !
so earned money = 20x
and for blacksmith she must work for 30-x hours
so earned money = (30-x) ×25
so putting in eqn;
20x+25(30-x) = 690
so, x= 60/5 = 12
so she works for carpenter for 12 hrs and 30-12= 18 hrs for blacksmith
