— 3y — 4х = -11
3y — 5х = — 61

x = 8

y = -7

Step-by-step explanation:

-3y - 4х = - 11   (1)

3y - 5х = - 61 (2)

From equation (2),

3y = -61 + 5x

divide through by 3 to have 'y' as the subject

y = -61/3 + 5x/3 (3)

Substitute for 'y' in equation (1) to get 'x'

Putting equation (3) in equation (1)

-3 (-61/3 + 5x/3) - 4x = -11

Open the bracket first

61 + (-5x) - 4x = -11

61 - 5x - 4x = -11

61 - 9x = -11

collect like terms

61 + 11 = 9x

72 = 9x

divide through by 9

8 = x

∴ x = 8

Substitute for x in either of the above equation to get 'y'

Using equation (3)

y = -61/3 + 5(8)/3

simplify

y = -61/3 + 40/3

common denominator

y = (-61 +40) / 3

y = -21 / 3

y = -7

just do 5.2 + 2 ( 7.2) and 1/3 x 3 (.9) and youv'e got your equation. 0.9( 9/10) + 7.2 ^2 = 16.4 hope i could !

step-by-step explanation:

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0