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2x - 3y equals 4 and x plus 4y equals -9?
(-1,-2)
Solve this equation using subtitution 2x-3y equals 4 and x plus 4y equals -9?
2x-3y = 4 x+4y = -9 => x = -9-4y Substitute x = -9-4y into the top equation: 2(-9-4y)-3y = 4 -18-8y-3y = 4 -8y-3y = 4+18 -11y = 22 Divide both sides by -11 to find the value of y: y = -2 Substitute the value of y into the original equations to find the value of x: Therefore: x = -1 and y = -2 Remember that the product of a minus times a minus is equal to a plus when working out the original equations,
What does y equal if its 3y equals 7y plus 24.4?
3y=7y+24.4 First, try to get all the y-terms on the same side of the equation. Easily done here by subtracting 7y from both sides 3y-7y=7y-7y+24.4 -4y=24.4 Now divide by -4 -4y/-4=24.4/-4 y=-6.1
How do you work out 7y - 3y - 14 equals 14?
7y-3y-14=14 4y-14=14 4y-14+14=14+14 (adding 14 on both side) 4y=28 (4y)/4=28/4 (dividing by 4 on both side) y=28/4=7
What is the solution of 4y-x equals 10 3y plus 5x equals -4?
x=-2, y=2
