x = variable
3x + 1 = 5x - 15
16 = 2x
? = x
One more than 3 times a number is the same as 5 times the number, decreased by 15. Find the number.
• Assign the variable
• Write an equation
• Solve equation
3 answers
1 + 3x = 5x - 15
1 + 3x-3x = 5x-3x - 15
1 = 2x - 15
1+15 = 2x - 15+15
16 = 2x
16/2 = 2x/2
8 = x or x = 8
1 + 3x-3x = 5x-3x - 15
1 = 2x - 15
1+15 = 2x - 15+15
16 = 2x
16/2 = 2x/2
8 = x or x = 8
3p+1 = 5p-15
3P+ 1+15 = 5P -15 +15
3p +16 = 5p
3p-3p+16 = 5p -3p
16 = 2p
p = 8
3P+ 1+15 = 5P -15 +15
3p +16 = 5p
3p-3p+16 = 5p -3p
16 = 2p
p = 8