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# What is the answer to equation 4y -9 equals 15?

Updated: 12/16/2022

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Q: What is the answer to equation 4y -9 equals 15?
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### What is 4y-9 equals 15?

4y-9 = 15 4y = 15+9 4y = 24 y = 6

y = -6

### Is 4y squared plus 9 equals - 4 a linear equation?

No. It's a quadratic equation, and it has two solutions.

### What equation forms a line that is parallel to the line formed by the equation 3x minus 4y equals 9?

3x-4y = 9 -4y = -3x+9 y = 3/4x-9/4 The equation parallel to this can be y = 3/4x+9/4 because the slope or gradient is the same but the y intercept is different.

y = 6

### What is 15y2 plus 45y - 9 equals 4y - 5y2?

15y2 + 45y - 9 = 4y - 5y2; thus, 20y2 + 41y - 9 = (5y - 1)(4y + 9) = 0. Therefore, the solution to the equation given is, y = 1/5 or -2&frac14;.

### Solve this system of equation using substitution 2x -3y equals -4 and x plus 4y equals -9?

2x - 3y = -4x + 4y = -9from the second equation x = -9-4y , substitute it in the first equation.2(-9-4y)- 3y= -4-18-8y-3y = -4-18-11y = -4-11y = -4+18-11y = 14y = -14/11now, solve for x :x = -9-4yx = -9-4(-14/11)x = -43/11

### What would x and y be if the equation is 3x-4y equals 10 and -3x equals 4y equals 8?

3x - 4y = 10-3x - 4y = 8 -> add line 1 to line 2 3x - 4y = 100x - 8y = 18 -> -8y = 18 -> y = -18/8 = -9/4 -> 3x - 4*(-9/4) = 10 -> 3x + 9 = 10 -> 3x = 1 -> x = 1/3

### If you were to solve the following system by substitution what would be the best variable to solve for and from what equation 2x plus 6y equals 9 3x-12y equals 15?

2x + 6y = 93x - 12y = 15Chose the second equation because you can simplify it.3x - 12y = 15 divide by 3 to both sidesx - 4y = 5 add 4y to both sidesx = 4y + 5Replace 4y + 5 for x to the first equation.2x + 6y = 92(4y + 5) + 6y = 98y + 10 + 6y = 914y = -1y = -1/14x = 4y + 5x = 4(-1/14) + 5x = -2/7 + 5x = -2/7 + 35/7x = 33/7

### What is the y-intercept for this linear equation 5x - 4y equals 18?

-4y=-5x+18 is the same equation. Now divide both sides by -4 and you find the y intercept is -18/4 or -9/2

### What is 15-6 equals 9?

This is called an equation....

### What is the equation of that line that passes through the centre of the circle 2x2 plus 2y2 -8x -5y -1 equals 0 and is perpendicular to the line 4x plus 9y plus 5 equals 0?

Centre of circle: (2, 1.25) Slope of line: 9/4 Equation of line: y-1.25 = 9/4(x-2) =&gt; 4y-5 = 9x-18 =&gt; 4y = 9x-13