2007-09-02 14:25:52 · 7 answers · asked by Shane S 1 in Science & Mathematics ➔ Mathematics
2x + 3 + y - 2 = 90
2x + 3 + y = 92
2x + y = 89
y = 89 - 2x
x = 0 y = 89
x = 44 1/2 y = 0
linear equations are written in the form y = mx + b
m = slope ( rise divided by the run )
slope the change in y values divided by the change in the x values.
your solution is a linear equation with a slope of -2 and the point (0,89) and (44 1/2, 0)
2007-09-02 14:48:37 · answer #1 · answered by Will 4 · 0⤊ 0⤋
When solving for a variable you need at least as many equations as you have variables. Since you want the solution to two variables you need more than one equation.
So with just the information you have you can only calculate an infinite number of x and y values to fit the equation you have. If we simplify the equation we can calculate what y is relative to x:
2x+3+y-2=90
2x+y+1=90
2x+y=89
y= -2x + 89
This is the equation of a line. So the correct answer to your question would be to plot this line on an x-y graph.
2007-09-02 21:43:09 · answer #2 · answered by Skrap 3 · 0⤊ 0⤋
dont take my word but i belive that if u take 2x + 3 and get virtualy any number like this 2 x 4 = 8 than 8 + 3 = 11 ok now you take 90 - 11 = 79 than that means that you have to do this 81 - 2 = 79 so the whole question we end up with is 2x4+3+81-2=90 taaadda ...... i think? @(-_-)@ ya
2007-09-02 22:03:23 · answer #3 · answered by Jacob 1 · 0⤊ 0⤋
2x+3+y+2=90
2x+y+5=90
2x+y=85
You have 1 equation with 2 unknowns. There are infinite solutions.
You can choose any number for x and find y or vice versa.
2007-09-02 21:45:18 · answer #4 · answered by cidyah 7 · 0⤊ 0⤋
There are two ways to solve this a) graphically and b) using a solution set.
a) Rearrange the equation to y= -2x+89 (simplify your arithmetic and combine like terms). Now graph.
b) plug in a number for a and solve for b. keep going till you can plot by hand. The answer this way is actually " all real numbers"
With two unknowns there really should be two equations in order to solve. This helps to use matrices. Otherwise, the previous two methods are the only way.
2007-09-02 21:37:57 · answer #5 · answered by james w 5 · 0⤊ 0⤋
There are infinitely many solutions to this. In fact if you plot them on an X-Y graph they will form a line! If you rearrange it to
y = -2x + 89, it will have slope -2 and crosses the y-axis at (0,89)
2007-09-02 21:33:02 · answer #6 · answered by Anonymous · 0⤊ 0⤋
2x + 3 + y - 2 = 90
2x = 89 - y
x = 44 1/2 - 1/2y
y = 89 - 2x
2007-09-06 12:05:48 · answer #7 · answered by Jun Agruda 7 · 3⤊ 0⤋