x + y = -2
2x + 3y = -9
You solve this by elimination - multiply both sides of first equation by 3, then subtract, solve for x, then substitute in any of the equations to solve for y
3x + 3y = -6
2x + 3y = -9
subtracting,
x = 3
substituting into 1st equation,
y = -2-3 = -5
2x-11
-2x plus 3y equals 1
2x + 5y = 16 -2x - 3y = -14 2y = 2 y = 1 / x = 5.5 (5.5,1) or (5 1/2,1)
x = 3 and y = 2
2x + 3y = 17 3x + 4y = 24 (2x + 3x) + (3y + 4y) = (17 + 24) 5x + 7y = 41
2x plus 3y
2x-11
-2x plus 3y equals 1
2x + 5y = 16 -2x - 3y = -14 2y = 2 y = 1 / x = 5.5 (5.5,1) or (5 1/2,1)
x = 3 and y = 2
(2,7)
2x + 3y = 17 3x + 4y = 24 (2x + 3x) + (3y + 4y) = (17 + 24) 5x + 7y = 41
2x-3y=13
x - 3y = -3: multiply by -2 giving -2x + 6y = 6, but -2x + 6y = 12 so we have a problem! Misprint?
How do you add 2x plus 3y equals 18 in 5x-y equals 11
6x plus 3y minus 2x plus 5y equals 4x plus 8y.
Collect like terms: 2x + 3y + 3y - 5 - 6 2x + 6y - 11