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15=-3 6/13m

Convert mixed numbers to improper fractions.

3x13+6= apply negative -45/13

-45/13m=15

multiply both sides by 13

-45m=195

divide both sides by -45

m = -13/3 or -4 1/3

Your welcome! and hope this helps!

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w

- (2, -7)

- lines r and s and lines t and u must be parallel