3x + 2y = 8 y = 4x – 7
i need to solve for x and y
+34 This is a simple algebra problem. You set X to set and get the value for X. You do the same thing for Y.
Once you get these vales, just plug them into your problem.
+36915 3x + 2y =8 y = 4x-7 SUb second equation in to the first...then solve for x
3x + 2 (4x-7) = 8
3x +8x -14 = 8
11x = 22
x = 2 Use this value of x to sub back in to one of the original equations to find y
y = 4x-7
y = 4(2) - 7
y = 1 so the solution point is (2,1)
+92 As listed above, others used substitution, but you can use elimination as another way to solve it
Using substitution is easiest because it already tells you what y is in terms of x
Elimination:
We try to subtract/add the two sentences to remove the extra variable
I can multiply 3x+2y=8 by 4 to get 12x+8y=32
I can them multiply y=4x-7 by 3 to get 3y=12x-21
Now by subtracting these two sentences I can remove the x value
After I get rid of my x value, the y variable will be the only variable left, where we can now solve the Algebra equation.
