Examples of perpendicular lines
1. Are these straight lines perpendicular?
The formula for each line is:
`y = 2x + 4`
And `y=-1/2x-1`
And ` y=mx+c` where m is the gradient
The test for perpendicular
`m_1\times\m_2=-1`
`2\times-1//2=?`
`2\times-1//2=-1`
Yes these lines are perpendicular.
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-1.4df6ee6.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-2.d516bb3.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-1.b0b0513.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-2.f89189d.jpg)