Question

Solve for a:

a – 17 = -15
A. a = -32
B. a = 2
C. a = 32
D. a = 12

Answer 1

Answer: B

1. Change unknown variable position, to right (its already here, so we don’t change anything.), amd number to left, without forgetting to change the sign:

A - 17 = -15
A = -15 + 17
A = 2

So the answer is, B)A = 2.

Proof:

2 - 17 = -15.

Answer 2

Answer: a = 2

Big Idea:

In order to solve this equation, I'm going to isolate x.

Step-by-step solution:

Given equation:

`\bigstar\quad\sf{a-17=-15}`

In order to isolate a, I'll add 17 to both sides:

`\bigstar\quad\sf{a=-15+17}`

Simplify:

`\bigstar\quad\sf{a=2}` {answer}

Therefore, a = 2.