need steps of how to solve system by graphing this
x+y=-1
y=2x+8
2007-06-12 17:50:04 · 3 answers · asked by missy 2 in Science & Mathematics ➔ Mathematics
in 1st equation, when x = 0, y = -1, and when y = 0, x = -1. locate -1 on x axis and y axis and draw line through them.
2nd equation has slope = 2 and y intercept = 8. locate 8 on y axis, then go right 1 and up 2 to (9,10) and plot another point, then draw line through them.
the point where the 2 lines intersect is the solution. looks like about (-3,2)
2007-06-12 17:56:13 · answer #1 · answered by Philo 7 · 0⤊ 0⤋
take two values of x & get y using first equation. You will get two points. For example
x=1 --> 1+y=-1---->y=-2
x=2---> 2+y=-1----> y=-3
The two pints on the line are (1,-2) & (2,-3)
Draw these points & line passing through these two points.
Similarly find two points for second equation & draw line.
The value of x & y at the point of intersection of these two lines is the answer.
2007-06-13 00:57:29 · answer #2 · answered by Jain 4 · 0⤊ 0⤋
on the top one you have to solve for "Y" so you get slope intercept form and the the number in front of the x is your slope. then the extra number at the end is where the line will pass through on the y intercept
2007-06-13 01:09:21 · answer #3 · answered by Anonymous · 0⤊ 0⤋