Question

Find the solution to the system of equations: x + 3y = 7

Answer 1

Simultaneous equations:

x+3y = 7 ---- (1)

2x+4y = 81 --- (2)

From eqn (1)

x = 7-3y ---- (3)

Substituting for x in eqn (2)

2(7-3y)+4y = 81

14-6y+4y = 81

14-2y = 81

-2y = 81 - 14 = 67

-2y = 67

y = 67/-2 = -33.5

And then, from eqn (3);

x = 7-3y = 7-3(-33.5) = 7-100.5 = -93.5

The solution for the system of equations is;

x = -93.5

y = -33.5

Answer 2

Answer:

on edu the correct  answers are -2 and 3

I hope this helps you.