If 4x+7=12 what is the value of 8x+3
2 answers:
There is actually 2 ways to solve this, I will show you both.
The first is obvious, solve for x in the first one, and plug it into the 2nd one and get the answer
4x + 7 = 12
4x = 5
x = 
8(
) + 3
2 * 5 + 3
10 + 3
13
The 2nd option is to manipulate the 4x + 7 to be 8x + 3
4x + 7 = 12
start by moving the 7 over
4x = 5
multiply both sides by 2
8x = 10
and add 3 to both sides
8x + 3 = 13
Solve for x in the equation then plug it into the expression.
- 4x + 7 = 12
- 8x + 3
4x + 7 = 12
- Subtract 7 from both sides.
4x = 5
x = 5/4
- Plug 5/4 for x into 8x + 3.
8(5/4) + 3 = 13
<h3>13</h3>
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