Petra’s electricity supply company charges her a fixed quarterly sum plus a rate per unit for electricity used. In the most expe
2 answers:
You might be interested in
First, distribute 3 into the parenthesis(multiply it to every term inside):
Add 21 to both sides:
Subtract 15m to both sides:
Divide -11 to both sides:
To check our work we can plug this back into the original equation for 'm':
Multiply:
Distribute 3 into the parenthesis:
Subtract:
Both sides are equal to each other, so we solved it correctly.