Explanation:
- Here, We are given the value of x and we need to solve for x first of all and then put that value of x in the second equation...
X²=64 ----- 1️⃣
2x-20 ----- 2️⃣
By equation 1️⃣ we have:
[tex] \sf {x}^{2} = 64 \\ \sf \: x = \sqrt{64} \\ \sf \: x = 8[/tex]
Substitute this value into equation 2️⃣:
[tex] \sf \: 2x - 20 \\ \sf \: 2 \times 8 - 20 \\ \sf \: 16 - 20 \\ \boxed{ \tt \: - 4}[/tex]
