JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE HTML>
<html>
	<head>
		<script>
			
				 function multiply2(a,b){
						var c = [ ( (a[0]*b[0]) + (a[1]*b[1]) ) , ( (a[2]*b[0]) + (a[3]*b[1]) ) ];
						return c;
				}
					
				function inverse(a){
						var det = (1/((a[0]*a[3]) - (a[2]*a[1])));
						var result = [(det*a[3]) , (-(det*a[1])) , (-(det*a[2])) , (det*a[0])] ;
						return result;
				}
				
				function main(a,b,c,d,x,y){
									
					var A = [
						a , b,
						c , d
					];
					var B = [
						x,
						y
					];
		
					var result = multiply2( inverse(A) , B );
					return "x = " + String(result[0]) + "y = " + String(result[1]);
				}
				
				function start(){
					var oneOne = document.getElementById("oneOne");
					var oneTwo = document.getElementById("oneTwo");
					var oneThree = document.getElementById("oneThree");
					var twoOne = document.getElementById("twoOne");
					var twoTwo = document.getElementById("twoTwo");
					var twoThree = document.getElementById("twoThree");
					
					var one_one = Number(oneOne.value);
					var one_two = Number(oneTwo.value);
					var one_three = Number(oneThree.value);
					var two_one = Number(twoOne.value);
					var two_two = Number(twoTwo.value);
					var two_three = Number(twoThree.value);
					
					var final = main( one_one , one_two , two_one , two_two , one_three , two_three );
					
					var workArea = document.getElementById("final");
					workArea.innerHTML = final ;
			}
			
			
		</script>
		
	</head>
		
	<body>
			
				<tr>
					<p>Equation 1:</p>
					<br />
					<td>
						 <input type = "text" name = "oneOne" id = "oneOne" value = " "/>
						 <label for = "oneOne" >x</label>
					</td>
					 + 
					<td>
						<input type = "text" name = "oneTwo" id = "oneTwo" value = " "/>
						<label for = "oneTwo">y</label>
					</td>
					 = 
					<td>
						<input type = "text" name = "oneThree" id = "oneThree" value = " "/>
					</td>
				</tr>
				<br />
				<tr>
					<p>Equation 2:</p>
					<br />
					<td>
						<input type =...