A set of equations can be used to find m, the amount of money in dollars Mr. Franklin earns from piano lessons each Saturday is:
D. 15 × 3 = 45
20 × 4 = 80
45 + 80 = m
In Mathematics and Geometry, an equation is a mathematical expression which shows that two or more thing are equal. This ultimately implies that, an equation is composed of two expressions that are connected by an equal sign.
Since Mr. Franklin teaches 3 piano lessons and charges $15, we have:
15 × 3 = 45 ...equation 1.
Since Mr. Franklin teaches 4 piano lessons and charges $20, we have:
20 × 4 = 80 ...equation 2.
Therefore, his total earnings each Saturday is given by the sum of each of his earnings;
45 + 80 = m
Complete Question:
Each Saturday Mr. Franklin teaches 3 piano lessons at his music school and 4 piano lessons in students’ homes.
• For each lesson at his music school, he charges $15.
• For each lesson in a student’s home, he charges $20.
Which set of equations can be used to find m, the amount of money in dollars Mr. Franklin earns from piano lessons each Saturday?
15 × 4 = 60
20 × 3 = 60
60 + 60 = m
15 ÷ 3 = 5
20 ÷ 4 = 5
5 + 5 = m
15 × 3 = 45
20 × 4 = 80
80 - 45 = m
15 × 3 = 45
20 × 4 = 80
45 + 80 = m