Please help!
2007-07-17 07:26:35 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Draw two lines
y = x-7
y = 2x+4
Find the value of x at the point where they intersect (because they are equal to each other)
This will be your solution (root) and will occur at x = -11
P(-11,-18)
Thus demonstrating that -11 is the root of x-7 = 2x+4 without solving the equation (algebraically)
QED
2007-07-17 07:30:16 · answer #1 · answered by Orinoco 7 · 0⤊ 0⤋
x-7=2x+4
-11-7 =2(-11) +4
-18 = -22 + 4
-18 = -18
Thus -11 satisfies the equation.
2007-07-17 14:31:06 · answer #2 · answered by ironduke8159 7 · 0⤊ 0⤋
Wow, deja vu. Anyway, just like the x=7 problem, just plug in x= -11. If both sides calculate out to be the same, then x= -11 is a solution.
2007-07-17 14:37:46 · answer #3 · answered by Anonymous · 0⤊ 0⤋
you just put -11 instid of x the the 2 sides will be equal
2007-07-17 14:34:51 · answer #4 · answered by 1145 2 · 0⤊ 0⤋