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1. 50% of 70 is
2. 80% of 500 is
3. 75% of 80 is

1. 35

2. 400

3. 60

Step-by-step explanation:

1. 50% of 70 is 35.

2. 80% of 500 is 400.

3. 75% of 80 is 60.

Step-by-step explanation:

= 50% × 70

= (50/100) × 70

= 70/2

= 35

= 80% of 500

= (80/100) × 500

= (4×500)/5

= 4×100

= 400

= 75% of 80

= (75/100) × 80

= (3×80)/4

= 3×20

= 60

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

answer: 4 (:

step-by-step explanation: