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What expression is equivalent to 42x-56y

What rule describes a dilation with a scale factor of 4 and the center of dilation at the origin?

Abari owns 100 shares of stock a and 45 shares of stock b. for the past month, his stocks have been fluctuating inversely. stock a decreased by m cents per share and stock b increased by n cents per share. which equation can be used to find the total change in value of jabari's shares per month?