Question

How would I solve y=8x+5 and y=4x+21?

Answer 1

x = 4

Explanation:

Since both are equal to variable y, by deduction, the two equations are equal to each other. So we can set them equal to each other.

8x + 5 = 4x + 21

Now, we must get variables on one side and constants on the other. To do so, subtract 4x from both sides and 5 from both sides.

8x - 4x = 21 - 5

Combine like terms.

4x = 16

Now, divide both sides by 4 to isolate variable x.

4x / 4 = 16 / 4

x = 4