Mathematics: I need help this is very hard please

Select all the equations that can be represented by a straight line when graphed on the coordinate plane...

I need help this is very hard please

nikeahbrown

18.01.2022

7 + 6 = 9 + 4

16 - 7 = 3 + 6

20 x 6 = 60 x 2

2 x (3 + 5) = 20 - 4

3 + (3 x 6) = 3 + 3 + 15

Solution:

Given that, we have to find the missing numbers in each equation

First equation:

Let the unknown be "x"

7 + x = 9 + 4

Solve the right side of equation, 9 + 4 = 13

7 + x = 13

x = 13 - 7

x = 6

Second equation:

Let the unknown be "x"

16 - 7 = 3 + x

Solve the left side of equation, 16 - 7 = 9

9 = 3 + x

x = 9 - 3

x = 6

Third Equation:

$D \times 6 = 60 \times 2\\\\D \times 6 = 120\\\\D = \frac{120}{6}\\\\D = 20$

Fourth Equation:

$2 \times (3 + 5) = x - 4\\\\Solve\ for\ brackets\\\\2 \times 8 = x - 4\\\\16 = x - 4\\\\x = 16 + 4\\\\x = 20$

Fifth Equation:

Let the unknown be "x"

$x + ( 3 \times 6) = x + x + 15\\\\Solve\ for\ brackets\\\\x + 18 = 2x + 15\\\\Combine\ the\ like\ terms\\\\2x - x = 18 - 15\\\\x = 3$

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