book Maths Puzzle Numerical Ability

i have a problem... 2/7=x/-42
I know you cross multiply
7x=-84
x=-84-7
x=-91
Im i right?

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book Other Question

"find the fifth,tenth, and hundredth terms of each sequence."
14,14,24,34... Solve each system by graphing

20. y = - x
2x + 3y = 5

Solve each system by the substitution method. Determine whether the equations are independent, dependent, or in