Question

Write a full program that solves the following equation and displays the value for x and y: 3.4x+50.2y=44.5 2.1x+.55y=5.9

Answer 1

// C++ code
#include <iostream>
#include <string>
#include <fstream>
#include <stdlib.h>
#include <math.h>
#include <vector>
#include <iomanip>      // std::setprecision

using namespace std;

int main()
{
    double a1,b1,c1;
    double a2,b2,c2;

    a1 = 3.4;
    b1 = 50.2;
    c1 = 44.5;
    a2 = 2.1;
    b2 = 0.55;
    c2 = 5.9;

    b1 = b1 /a1;
    c1 = c1 /a1;
    a1 = 1;

    b2 = b2 /a2;
    c2 = c2 /a2;
    a2 = 1;

    double y = (c1-c2)/(b1-b2);

    double x = (c1-y*b1);

    cout << "x: " << x << endl;
    cout << "y: " << y << endl;

    return 0;
}

/*
output:

x: 2.6239
y: 0.70874

*/