Question 1073113

Good Afternoon,

Please help me to solve this equation: 3x-4y= -24 and x + y = -1.
I tried by solving this using simultaneous equation but I did not come alright.

here is my try:
3x-4y = -24 -x -y= -1 y == 3/4x-6(answer) but there is no answers mash.
I subtract equation 2 from equation 1
<pre>The easiest method is SUBSTITUTION
3x - 4y = - 24 -------- eq (i)
x + y = - 1_____y = - 1 - x ------ eq (ii)
3x - 4(- 1 - x) = - 24 ------ Substituting - 1 - x for y in eq (i)
3x + 4 + 4x = - 24
3x + 4x = - 24 - 4
7x = - 28
{{{highlight_green(matrix(1,5, x, "=", (- 28)/7, or, - 4))}}}

y = - 1 - - 4 ------ Substituting - 4 for x in eq (ii)
{{{highlight_green(matrix(1,7, y, "=", - 1, "+", 4, or, 3))}}}