Pls i need with these 2 question pls. for my hw

a-x=7.5

b=x=1

Step-by-step explanation:

-x2 on either side.

add 1 on either side

subtract 2x on either side

divide by 2

15=2x

-x3 on either side

subtract 6 on either side

subtract 2x on either side

divide by 7

the volume is the product of the area of the base, 3x(3x+4), and the height, 3x-1

step-by-step explanation:

5x + 3y = - 4

step-by-step explanation:

the equation of a line in standard form is

ax + by = c ( a is a positive integer and b, c are integers )

express the line first of all in slope- intercept form

y = mx + c ( m is the slope and c the y-intercept )

to calculate m use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (7, - 3) and (x₂, y₂ ) = (4, - 8)

m = = -

y = - x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (4, - 8 ), then

- 8 = - + c ⇒ c = -

y = - x - ← in slope-intercept form

multiply all terms by 3 to eliminate the fractions

3y = - 5x - 4 ( add 5x to both sides )

5x + 3y = - 4 ← in standard form