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Hard 7th Grade Math Homework HELP


3y + 6x = 24

5= 4y - 3x

Solve 7y + 7x = 21x + 35 for y

Solve 4m - (2n to the 2nd power) = 2m - 72 for m

Solve 9g + 7h = 9g - 7h + g for g

Solve 3/4 r - 1/2 = 1_1/4 r + 8s for r

Relative Answer:


1. y=2, x=3
(Did that mentally, Guess &Check)

2. y=5, x=5

*** For the above two, you can solve them using system of equations. If they were a pair in a system you solve like this:


PICK ANY EQUATION:
3y+6x=24
y+3x=8
y= (-3)x +8

THEN, you substitute that entire thing for "Y" in the other equation, like this:

5=4y - 3x
5 = 4(-3x +8) - 3x
5 = -12x + 32 - 3x
5= 32- 15x
-27 = -15x
x = -15/-27
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