7x - 4y = 5 and 8x + y = -11
Transform one equation into its Slope-intercept form (y=mx+b)
8x + y = -11
y = -8x - 11
Substitute the value of "y" (-8x - 11) as the value of "y" to the other equation.
7x - 4 (-8x - 11) = 5
7x + 32x + 44 = 5
39x + 44 = 5
39x = 5 - 44
39x = -39
39x = -39
39 39
x = -1
Substitute the value of "x" (-1) as the value of "x" to the other equation.
8(-1) + y = -11
-8 + y = -11
y = -11 + 8
y = -3
Solutions: (-1,-3)
-KookEin
